521853534457421 has 16 divisors (see below), whose sum is σ = 575454746400000. Its totient is φ = 471297437222976.

The previous prime is 521853534457393. The next prime is 521853534457511. The reversal of 521853534457421 is 124754435358125.

It is a cyclic number.

It is not a de Polignac number, because 521853534457421 - 2¹⁴ = 521853534441037 is a prime.

It is a super-2 number, since 2×521853534457421² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521853534457721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5994276746 + ... + 5994363803.

It is an arithmetic number, because the mean of its divisors is an integer number (35965921650000).

Almost surely, 2^{521853534457421} is an apocalyptic number.

It is an amenable number.

521853534457421 is a deficient number, since it is larger than the sum of its proper divisors (53601211942579).

521853534457421 is a wasteful number, since it uses less digits than its factorization.

521853534457421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11988640676.

The product of its digits is 80640000, while the sum is 59.

The spelling of 521853534457421 in words is "five hundred twenty-one trillion, eight hundred fifty-three billion, five hundred thirty-four million, four hundred fifty-seven thousand, four hundred twenty-one".