21313231312 has 20 divisors (see below), whose sum is σ = 41299209856. Its totient is φ = 10655370720.

The previous prime is 21313231309. The next prime is 21313231343.

21313231312 is nontrivially palindromic in base 10.

It is a congruent number.

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, 72193 + ... + 218719.

Almost surely, 2^21313231312 is an apocalyptic number.

It is an amenable number.

21313231312 is a deficient number, since it is larger than the sum of its proper divisors (19985978544).

21313231312 is a wasteful number, since it uses less digits than its factorization.

21313231312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155626 (or 155620 counting only the distinct ones).

The product of its digits is 648, while the sum is 22.

The spelling of 21313231312 in words is "twenty-one billion, three hundred thirteen million, two hundred thirty-one thousand, three hundred twelve".