21523033968 has 40 divisors (see below), whose sum is σ = 56957302416. Its totient is φ = 6999360000.

The previous prime is 21523033963. The next prime is 21523033979. The reversal of 21523033968 is 86933032512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21523033963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5466283 + ... + 5470218.

Almost surely, 2^21523033968 is an apocalyptic number.

It is an amenable number.

21523033968 is an abundant number, since it is smaller than the sum of its proper divisors (35434268448).

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

21523033968 is a wasteful number, since it uses less digits than its factorization.

21523033968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10936553 (or 10936547 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

The spelling of 21523033968 in words is "twenty-one billion, five hundred twenty-three million, thirty-three thousand, nine hundred sixty-eight".