521253020 has 24 divisors (see below), whose sum is σ = 1095144624. Its totient is φ = 208403456.

The previous prime is 521253001. The next prime is 521253043. The reversal of 521253020 is 20352125.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 521252983 and 521253001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50327 + ... + 59793.

It is an arithmetic number, because the mean of its divisors is an integer number (45631026).

Almost surely, 2^521253020 is an apocalyptic number.

It is an amenable number.

521253020 is an abundant number, since it is smaller than the sum of its proper divisors (573891604).

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

521253020 is a wasteful number, since it uses less digits than its factorization.

521253020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12229 (or 12227 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 521253020 is about 22830.9662520008. The cubic root of 521253020 is about 804.7905374289.

The spelling of 521253020 in words is "five hundred twenty-one million, two hundred fifty-three thousand, twenty".