21031020922 has 32 divisors (see below), whose sum is σ = 35845545600. Its totient is φ = 9200334528.

The previous prime is 21031020839. The next prime is 21031020937. The reversal of 21031020922 is 22902013012.

It is a junction number, because it is equal to n+sod(n) for n = 21031020893 and 21031020902.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 389533 + ... + 440224.

It is an arithmetic number, because the mean of its divisors is an integer number (1120173300).

Almost surely, 2^21031020922 is an apocalyptic number.

21031020922 is a deficient number, since it is larger than the sum of its proper divisors (14814524678).

21031020922 is a wasteful number, since it uses less digits than its factorization.

21031020922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829830.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21031020922 its reverse (22902013012), we get a palindrome (43933033934).

The spelling of 21031020922 in words is "twenty-one billion, thirty-one million, twenty thousand, nine hundred twenty-two".