21232320312 has 64 divisors (see below), whose sum is σ = 61954513920. Its totient is φ = 5937303168.

The previous prime is 21232320299. The next prime is 21232320353. The reversal of 21232320312 is 21302323212.

It is a happy number.

It is a super-2 number, since 2×21232320312² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1336603 + ... + 1352394.

It is an arithmetic number, because the mean of its divisors is an integer number (968039280).

Almost surely, 2^21232320312 is an apocalyptic number.

It is an amenable number.

21232320312 is an abundant number, since it is smaller than the sum of its proper divisors (40722193608).

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

21232320312 is a wasteful number, since it uses less digits than its factorization.

21232320312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2689060 (or 2689056 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21232320312 its reverse (21302323212), we get a palindrome (42534643524).

The spelling of 21232320312 in words is "twenty-one billion, two hundred thirty-two million, three hundred twenty thousand, three hundred twelve".