21312333320 has 32 divisors (see below), whose sum is σ = 47982369600. Its totient is φ = 8519667648.

The previous prime is 21312333311. The next prime is 21312333353. The reversal of 21312333320 is 2333321312.

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, 98660 + ... + 228819.

It is an arithmetic number, because the mean of its divisors is an integer number (1499449050).

Almost surely, 2^21312333320 is an apocalyptic number.

21312333320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21312333320 is an abundant number, since it is smaller than the sum of its proper divisors (26670036280).

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

21312333320 is a wasteful number, since it uses less digits than its factorization.

21312333320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329117 (or 329113 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21312333320 its reverse (2333321312), we get a palindrome (23645654632).

The spelling of 21312333320 in words is "twenty-one billion, three hundred twelve million, three hundred thirty-three thousand, three hundred twenty".