21320311232 has 56 divisors (see below), whose sum is σ = 46171512432. Its totient is φ = 9687296000.

The previous prime is 21320311223. The next prime is 21320311261. The reversal of 21320311232 is 23211302312.

It is a congruent number.

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, 2694482 + ... + 2702382.

Almost surely, 2^21320311232 is an apocalyptic number.

21320311232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21320311232 is an abundant number, since it is smaller than the sum of its proper divisors (24851201200).

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

21320311232 is a wasteful number, since it uses less digits than its factorization.

21320311232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11757 (or 11747 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21320311232 its reverse (23211302312), we get a palindrome (44531613544).

The spelling of 21320311232 in words is "twenty-one billion, three hundred twenty million, three hundred eleven thousand, two hundred thirty-two".