521157199922 has 18 divisors (see below), whose sum is σ = 784152140247. Its totient is φ = 259775632224.

The previous prime is 521157199919. The next prime is 521157199931. The reversal of 521157199922 is 229991751125.

It can be written as a sum of positive squares in 5 ways, for example, as 176399160001 + 344758039921 = 419999^2 + 587161^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=510469.

It is a Duffinian number.

Its product of digits (1020600) is a multiple of the sum of its prime factors (3150).

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 466568108 + ... + 466569224.

Almost surely, 2^521157199922 is an apocalyptic number.

521157199922 is a deficient number, since it is larger than the sum of its proper divisors (262994940325).

521157199922 is an frugal number, since it uses more digits than its factorization.

521157199922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3150 (or 1576 counting only the distinct ones).

The product of its digits is 1020600, while the sum is 53.

The spelling of 521157199922 in words is "five hundred twenty-one billion, one hundred fifty-seven million, one hundred ninety-nine thousand, nine hundred twenty-two".