21320031000 has 64 divisors (see below), whose sum is σ = 66518506080. Its totient is φ = 5685340800.

The previous prime is 21320030999. The next prime is 21320031013. The reversal of 21320031000 is 13002312.

It is a happy number.

It is a super-2 number, since 2×21320031000² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3550339 + ... + 3556338.

Almost surely, 2^21320031000 is an apocalyptic number.

21320031000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21320031000 is an abundant number, since it is smaller than the sum of its proper divisors (45198475080).

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

21320031000 is a wasteful number, since it uses less digits than its factorization.

21320031000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7106701 (or 7106687 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21320031000 its reverse (13002312), we get a palindrome (21333033312).

The spelling of 21320031000 in words is "twenty-one billion, three hundred twenty million, thirty-one thousand".