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21102121220000 = 25541055106061
BaseRepresentation
bin1001100110001001110000…
…11100000111011110100000
32202201100021002222102012012
410303010320130013132200
510231214121013020000
6112514103004452052
74305402143563202
oct463047034073640
982640232872165
1021102121220000
1167a63a5330007
12244989584a028
13ba0bc9699672
1452d4c3336772
15268dabb91735
hex1331387077a0

21102121220000 has 60 divisors (see below), whose sum is σ = 51914383568586. Its totient is φ = 8440848480000.

The previous prime is 21102121219939. The next prime is 21102121220009. The reversal of 21102121220000 is 2212120112.

It can be written as a sum of positive squares in 5 ways, for example, as 51679838224 + 21050441381776 = 227332^2 + 4588076^2 .

It is not an unprimeable number, because it can be changed into a prime (21102121220009) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 527533031 + ... + 527573030.

Almost surely, 221102121220000 is an apocalyptic number.

21102121220000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102121220000 is an abundant number, since it is smaller than the sum of its proper divisors (30812262348586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21102121220000 is an equidigital number, since it uses as much as digits as its factorization.

21102121220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055106091 (or 1055106068 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21102121220000 its reverse (2212120112), we get a palindrome (21104333340112).

The spelling of 21102121220000 in words is "twenty-one trillion, one hundred two billion, one hundred twenty-one million, two hundred twenty thousand".

Divisors: 1 2 4 5 8 10 16 20 25 32 40 50 80 100 125 160 200 250 400 500 625 800 1000 1250 2000 2500 4000 5000 10000 20000 1055106061 2110212122 4220424244 5275530305 8440848488 10551060610 16881696976 21102121220 26377651525 33763393952 42204242440 52755303050 84408484880 105510606100 131888257625 168816969760 211021212200 263776515250 422042424400 527553030500 659441288125 844084848800 1055106061000 1318882576250 2110212122000 2637765152500 4220424244000 5275530305000 10551060610000 21102121220000