521355414212 has 6 divisors (see below), whose sum is σ = 912371974878. Its totient is φ = 260677707104.

The previous prime is 521355414191. The next prime is 521355414241. The reversal of 521355414212 is 212414553125.

It can be written as a sum of positive squares in only one way, i.e., 435040499776 + 86314914436 = 659576^2 + 293794^2 .

It is a super-2 number, since 2×521355414212² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65169426773 + ... + 65169426780.

It is an arithmetic number, because the mean of its divisors is an integer number (152061995813).

Almost surely, 2^521355414212 is an apocalyptic number.

It is an amenable number.

521355414212 is a deficient number, since it is larger than the sum of its proper divisors (391016560666).

521355414212 is a wasteful number, since it uses less digits than its factorization.

521355414212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130338853557 (or 130338853555 counting only the distinct ones).

The product of its digits is 48000, while the sum is 35.

Adding to 521355414212 its reverse (212414553125), we get a palindrome (733769967337).

The spelling of 521355414212 in words is "five hundred twenty-one billion, three hundred fifty-five million, four hundred fourteen thousand, two hundred twelve".