21553368451320 has 32 divisors (see below), whose sum is σ = 64660105354320. Its totient is φ = 5747564920320.

The previous prime is 21553368451319. The next prime is 21553368451393. The reversal of 21553368451320 is 2315486335512.

It is a self number, because there is not a number n which added to its sum of digits gives 21553368451320.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89805701761 + ... + 89805702000.

Almost surely, 2^{21553368451320} is an apocalyptic number.

21553368451320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21553368451320 is an abundant number, since it is smaller than the sum of its proper divisors (43106736903000).

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

21553368451320 is a wasteful number, since it uses less digits than its factorization.

21553368451320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179611403775 (or 179611403771 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 48.

The spelling of 21553368451320 in words is "twenty-one trillion, five hundred fifty-three billion, three hundred sixty-eight million, four hundred fifty-one thousand, three hundred twenty".