21213332320 has 48 divisors (see below), whose sum is σ = 50354096688. Its totient is φ = 8445104640.

The previous prime is 21213332317. The next prime is 21213332323. The reversal of 21213332320 is 2323331212.

It is an interprime number because it is at equal distance from previous prime (21213332317) and next prime (21213332323).

It is a junction number, because it is equal to n+sod(n) for n = 21213332291 and 21213332300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213332323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280419 + ... + 347938.

It is an arithmetic number, because the mean of its divisors is an integer number (1049043681).

Almost surely, 2^21213332320 is an apocalyptic number.

21213332320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21213332320 is an abundant number, since it is smaller than the sum of its proper divisors (29140764368).

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

21213332320 is a wasteful number, since it uses less digits than its factorization.

21213332320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628583 (or 628575 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21213332320 its reverse (2323331212), we get a palindrome (23536663532).

The spelling of 21213332320 in words is "twenty-one billion, two hundred thirteen million, three hundred thirty-two thousand, three hundred twenty".