21022323020 has 24 divisors (see below), whose sum is σ = 44190501264. Its totient is φ = 8400620096.

The previous prime is 21022323001. The next prime is 21022323031. The reversal of 21022323020 is 2032322012.

It is a self number, because there is not a number n which added to its sum of digits gives 21022323020.

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, 498554 + ... + 539073.

It is an arithmetic number, because the mean of its divisors is an integer number (1841270886).

Almost surely, 2^21022323020 is an apocalyptic number.

21022323020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022323020 is an abundant number, since it is smaller than the sum of its proper divisors (23168178244).

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

21022323020 is a wasteful number, since it uses less digits than its factorization.

21022323020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038649 (or 1038647 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 21022323020 its reverse (2032322012), we get a palindrome (23054645032).

The spelling of 21022323020 in words is "twenty-one billion, twenty-two million, three hundred twenty-three thousand, twenty".