21913523352 has 64 divisors (see below), whose sum is σ = 69566745600. Its totient is φ = 6261006240.

The previous prime is 21913523347. The next prime is 21913523363. The reversal of 21913523352 is 25332531912.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 7245024 + ... + 7248047.

It is an arithmetic number, because the mean of its divisors is an integer number (1086980400).

Almost surely, 2^21913523352 is an apocalyptic number.

It is an amenable number.

21913523352 is an abundant number, since it is smaller than the sum of its proper divisors (47653222248).

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

21913523352 is a wasteful number, since it uses less digits than its factorization.

21913523352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14493093 (or 14493083 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The spelling of 21913523352 in words is "twenty-one billion, nine hundred thirteen million, five hundred twenty-three thousand, three hundred fifty-two".