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21112102100 = 2252211121021
BaseRepresentation
bin10011101010011000…
…010001110011010100
32000111100010220112102
4103222120101303110
5321214144231400
613410533341232
71345114623035
oct235230216324
960440126472
1021112102100
118a5425a871
124112497818
131cb5c04c0b
141043c94a8c
158386e29d5
hex4ea611cd4

21112102100 has 18 divisors (see below), whose sum is σ = 45813261774. Its totient is φ = 8444840800.

The previous prime is 21112102027. The next prime is 21112102147. The reversal of 21112102100 is 120121112.

It can be written as a sum of positive squares in 3 ways, for example, as 7585016464 + 13527085636 = 87092^2 + 116306^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105560411 + ... + 105560610.

Almost surely, 221112102100 is an apocalyptic number.

21112102100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112102100 is an abundant number, since it is smaller than the sum of its proper divisors (24701159674).

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

21112102100 is a wasteful number, since it uses less digits than its factorization.

21112102100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211121035 (or 211121028 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21112102100 its reverse (120121112), we get a palindrome (21232223212).

The spelling of 21112102100 in words is "twenty-one billion, one hundred twelve million, one hundred two thousand, one hundred".

Divisors: 1 2 4 5 10 20 25 50 100 211121021 422242042 844484084 1055605105 2111210210 4222420420 5278025525 10556051050 21112102100