21312023332 has 12 divisors (see below), whose sum is σ = 37665309276. Its totient is φ = 10550506400.

The previous prime is 21312023329. The next prime is 21312023389. The reversal of 21312023332 is 23332021312.

It can be written as a sum of positive squares in 2 ways, for example, as 12131700736 + 9180322596 = 110144^2 + 95814^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26375863 + ... + 26376670.

It is an arithmetic number, because the mean of its divisors is an integer number (3138775773).

Almost surely, 2^21312023332 is an apocalyptic number.

It is an amenable number.

21312023332 is a deficient number, since it is larger than the sum of its proper divisors (16353285944).

21312023332 is a wasteful number, since it uses less digits than its factorization.

21312023332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52752638 (or 52752636 counting only the distinct ones).

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

Adding to 21312023332 its reverse (23332021312), we get a palindrome (44644044644).

The spelling of 21312023332 in words is "twenty-one billion, three hundred twelve million, twenty-three thousand, three hundred thirty-two".