54455631021 has 144 divisors (see below), whose sum is σ = 95343393600. Its totient is φ = 30795448320.

The previous prime is 54455631019. The next prime is 54455631037. The reversal of 54455631021 is 12013655445.

54455631021 is a `hidden beast` number, since 54 + 4 + 556 + 31 + 0 + 21 = 666.

It is not a de Polignac number, because 54455631021 - 2¹ = 54455631019 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54455631001) by changing a digit.

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 143 ways as a sum of consecutive naturals, for example, 121281805 + ... + 121282253.

It is an arithmetic number, because the mean of its divisors is an integer number (662106900).

Almost surely, 2^54455631021 is an apocalyptic number.

54455631021 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

54455631021 is a deficient number, since it is larger than the sum of its proper divisors (40887762579).

54455631021 is a wasteful number, since it uses less digits than its factorization.

54455631021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666 (or 637 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 54455631021 in words is "fifty-four billion, four hundred fifty-five million, six hundred thirty-one thousand, twenty-one".