21100508492 has 24 divisors (see below), whose sum is σ = 42205482144. Its totient is φ = 9042118272.

The previous prime is 21100508467. The next prime is 21100508503. The reversal of 21100508492 is 29480500112.

It is a super-2 number, since 2×21100508492² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272408 + ... + 341184.

It is an arithmetic number, because the mean of its divisors is an integer number (1758561756).

Almost surely, 2^21100508492 is an apocalyptic number.

It is an amenable number.

21100508492 is an abundant number, since it is smaller than the sum of its proper divisors (21104973652).

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

21100508492 is a wasteful number, since it uses less digits than its factorization.

21100508492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79745 (or 79743 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The spelling of 21100508492 in words is "twenty-one billion, one hundred million, five hundred eight thousand, four hundred ninety-two".