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21202100210221 = 75261575721623
BaseRepresentation
bin1001101001000011111111…
…01001101100101000101101
32210001220022211002100102221
410310201333221230220231
510234333400123211341
6113032035501315341
74315541544145540
oct464417751545055
983056284070387
1021202100210221
11683483a916157
122465138565b51
13baa470a31188
14534289688857
1526b7ae12aed1
hex13487fa6ca2d

21202100210221 has 8 divisors (see below), whose sum is σ = 24235577483904. Its totient is φ = 18169774390320.

The previous prime is 21202100210189. The next prime is 21202100210237. The reversal of 21202100210221 is 12201200120212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21202100210221 - 25 = 21202100210189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21202100210195 and 21202100210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202100213221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287823985 + ... + 287897638.

It is an arithmetic number, because the mean of its divisors is an integer number (3029447185488).

Almost surely, 221202100210221 is an apocalyptic number.

It is an amenable number.

21202100210221 is a deficient number, since it is larger than the sum of its proper divisors (3033477273683).

21202100210221 is an equidigital number, since it uses as much as digits as its factorization.

21202100210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575726891.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21202100210221 its reverse (12201200120212), we get a palindrome (33403300330433).

Subtracting from 21202100210221 its reverse (12201200120212), we obtain a palindrome (9000900090009).

The spelling of 21202100210221 in words is "twenty-one trillion, two hundred two billion, one hundred million, two hundred ten thousand, two hundred twenty-one".

Divisors: 1 7 5261 36827 575721623 4030051361 3028871458603 21202100210221