521454888621 has 32 divisors (see below), whose sum is σ = 788097945600. Its totient is φ = 340687756080.

The previous prime is 521454888587. The next prime is 521454888629. The reversal of 521454888621 is 126888454125.

It is a happy number.

521454888621 is a `hidden beast` number, since 5 + 2 + 1 + 4 + 5 + 4 + 8 + 8 + 8 + 621 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-521454888621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521454888629) 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, 494281 + ... + 1134558.

It is an arithmetic number, because the mean of its divisors is an integer number (24628060800).

Almost surely, 2^521454888621 is an apocalyptic number.

It is an amenable number.

521454888621 is a deficient number, since it is larger than the sum of its proper divisors (266643056979).

521454888621 is a wasteful number, since it uses less digits than its factorization.

521454888621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1629086 (or 1629080 counting only the distinct ones).

The product of its digits is 4915200, while the sum is 54.

The spelling of 521454888621 in words is "five hundred twenty-one billion, four hundred fifty-four million, eight hundred eighty-eight thousand, six hundred twenty-one".