520413221402421 has 32 divisors (see below), whose sum is σ = 696906569384448. Its totient is φ = 345433127601600.

The previous prime is 520413221402387. The next prime is 520413221402447. The reversal of 520413221402421 is 124204122314025.

It is not a de Polignac number, because 520413221402421 - 2²⁷ = 520413087184693 is a prime.

It is a super-2 number, since 2×520413221402421² (a number of 30 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520413221402621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5724631650 + ... + 5724722556.

It is an arithmetic number, because the mean of its divisors is an integer number (21778330293264).

Almost surely, 2^{520413221402421} is an apocalyptic number.

It is an amenable number.

520413221402421 is a deficient number, since it is larger than the sum of its proper divisors (176493347982027).

520413221402421 is a wasteful number, since it uses less digits than its factorization.

520413221402421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96641.

The product of its (nonzero) digits is 30720, while the sum is 33.

Adding to 520413221402421 its reverse (124204122314025), we get a palindrome (644617343716446).

The spelling of 520413221402421 in words is "five hundred twenty trillion, four hundred thirteen billion, two hundred twenty-one million, four hundred two thousand, four hundred twenty-one".