21313020960 has 576 divisors, whose sum is σ = 91299446784. Its totient is φ = 4398336000.

The previous prime is 21313020923. The next prime is 21313020979. The reversal of 21313020960 is 6902031312.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 18516385 + ... + 18517535.

It is an arithmetic number, because the mean of its divisors is an integer number (158505984).

Almost surely, 2^21313020960 is an apocalyptic number.

21313020960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21313020960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45649723392).

21313020960 is an abundant number, since it is smaller than the sum of its proper divisors (69986425824).

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

21313020960 is a wasteful number, since it uses less digits than its factorization.

21313020960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357 (or 1346 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The spelling of 21313020960 in words is "twenty-one billion, three hundred thirteen million, twenty thousand, nine hundred sixty".