21313500312 has 64 divisors (see below), whose sum is σ = 58355136000. Its totient is φ = 6446841984.

The previous prime is 21313500301. The next prime is 21313500317. The reversal of 21313500312 is 21300531312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313500317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 560512 + ... + 597327.

It is an arithmetic number, because the mean of its divisors is an integer number (911799000).

Almost surely, 2^21313500312 is an apocalyptic number.

It is an amenable number.

21313500312 is an abundant number, since it is smaller than the sum of its proper divisors (37041635688).

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

21313500312 is a wasteful number, since it uses less digits than its factorization.

21313500312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157920 (or 1157916 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The spelling of 21313500312 in words is "twenty-one billion, three hundred thirteen million, five hundred thousand, three hundred twelve".