21231313012 has 48 divisors (see below), whose sum is σ = 45752866432. Its totient is φ = 8394814080.

The previous prime is 21231313003. The next prime is 21231313063. The reversal of 21231313012 is 21031313212.

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, 733087 + ... + 761497.

Almost surely, 2^21231313012 is an apocalyptic number.

It is an amenable number.

21231313012 is an abundant number, since it is smaller than the sum of its proper divisors (24521553420).

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

21231313012 is a wasteful number, since it uses less digits than its factorization.

21231313012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30488 (or 30486 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21231313012 its reverse (21031313212), we get a palindrome (42262626224).

The spelling of 21231313012 in words is "twenty-one billion, two hundred thirty-one million, three hundred thirteen thousand, twelve".