921306553272 has 128 divisors (see below), whose sum is σ = 3051947289600. Its totient is φ = 251785632384.

The previous prime is 921306553247. The next prime is 921306553273. The reversal of 921306553272 is 272355603129.

921306553272 is a `hidden beast` number, since 9 + 21 + 3 + 0 + 6 + 553 + 2 + 72 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921306553273) 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 31 ways as a sum of consecutive naturals, for example, 13211523 + ... + 13281074.

It is an arithmetic number, because the mean of its divisors is an integer number (23843338200).

Almost surely, 2^921306553272 is an apocalyptic number.

921306553272 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

921306553272 is an abundant number, since it is smaller than the sum of its proper divisors (2130640736328).

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

921306553272 is a wasteful number, since it uses less digits than its factorization.

921306553272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26492642 (or 26492632 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 45.

The spelling of 921306553272 in words is "nine hundred twenty-one billion, three hundred six million, five hundred fifty-three thousand, two hundred seventy-two".