21331023210 has 48 divisors (see below), whose sum is σ = 63383613696. Its totient is φ = 4875662304.

The previous prime is 21331023209. The next prime is 21331023271. The reversal of 21331023210 is 1232013312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16928754 + ... + 16930013.

It is an arithmetic number, because the mean of its divisors is an integer number (1320491952).

Almost surely, 2^21331023210 is an apocalyptic number.

21331023210 is an abundant number, since it is smaller than the sum of its proper divisors (42052590486).

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

21331023210 is a wasteful number, since it uses less digits than its factorization.

21331023210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33858787 (or 33858784 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21331023210 its reverse (1232013312), we get a palindrome (22563036522).

It can be divided in two parts, 2133102 and 3210, that added together give a palindrome (2136312).

The spelling of 21331023210 in words is "twenty-one billion, three hundred thirty-one million, twenty-three thousand, two hundred ten".