521042452420 has 24 divisors (see below), whose sum is σ = 1250501886144. Its totient is φ = 178643126496.

The previous prime is 521042452397. The next prime is 521042452421. The reversal of 521042452420 is 24254240125.

It is not an unprimeable number, because it can be changed into a prime (521042452421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1860865762 + ... + 1860866041.

It is an arithmetic number, because the mean of its divisors is an integer number (52104245256).

Almost surely, 2^521042452420 is an apocalyptic number.

It is an amenable number.

521042452420 is an abundant number, since it is smaller than the sum of its proper divisors (729459433724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521042452420 is a wasteful number, since it uses less digits than its factorization.

521042452420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3721731819 (or 3721731817 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 31.

Adding to 521042452420 its reverse (24254240125), we get a palindrome (545296692545).

The spelling of 521042452420 in words is "five hundred twenty-one billion, forty-two million, four hundred fifty-two thousand, four hundred twenty".