21031102992 has 160 divisors (see below), whose sum is σ = 57925756800. Its totient is φ = 6564253696.

The previous prime is 21031102969. The next prime is 21031102997. The reversal of 21031102992 is 29920113012.

It is a super-2 number, since 2×21031102992² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21031102997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6564463 + ... + 6567665.

It is an arithmetic number, because the mean of its divisors is an integer number (362035980).

Almost surely, 2^21031102992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21031102992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28962878400).

21031102992 is an abundant number, since it is smaller than the sum of its proper divisors (36894653808).

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

21031102992 is a wasteful number, since it uses less digits than its factorization.

21031102992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3385 (or 3379 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 30.

The spelling of 21031102992 in words is "twenty-one billion, thirty-one million, one hundred two thousand, nine hundred ninety-two".