21100109092 has 6 divisors (see below), whose sum is σ = 36925190918. Its totient is φ = 10550054544.

The previous prime is 21100109059. The next prime is 21100109117. The reversal of 21100109092 is 29090100112.

It can be written as a sum of positive squares in only one way, i.e., 16945790976 + 4154318116 = 130176^2 + 64454^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2637513633 + ... + 2637513640.

Almost surely, 2^21100109092 is an apocalyptic number.

It is an amenable number.

21100109092 is a deficient number, since it is larger than the sum of its proper divisors (15825081826).

21100109092 is a wasteful number, since it uses less digits than its factorization.

21100109092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5275027277 (or 5275027275 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 25.

The spelling of 21100109092 in words is "twenty-one billion, one hundred million, one hundred nine thousand, ninety-two".