521253220 has 48 divisors (see below), whose sum is σ = 1189440000. Its totient is φ = 191151360.

The previous prime is 521253203. The next prime is 521253283. The reversal of 521253220 is 22352125.

It is a junction number, because it is equal to n+sod(n) for n = 521253191 and 521253200.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10345 + ... + 33904.

It is an arithmetic number, because the mean of its divisors is an integer number (24780000).

Almost surely, 2^521253220 is an apocalyptic number.

It is an amenable number.

521253220 is an abundant number, since it is smaller than the sum of its proper divisors (668186780).

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

521253220 is a wasteful number, since it uses less digits than its factorization.

521253220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44308 (or 44306 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 521253220 is about 22830.9706320165. The cubic root of 521253220 is about 804.7906403591.

The spelling of 521253220 in words is "five hundred twenty-one million, two hundred fifty-three thousand, two hundred twenty".