521350420 has 12 divisors (see below), whose sum is σ = 1094835924. Its totient is φ = 208540160.

The previous prime is 521350411. The next prime is 521350439. The reversal of 521350420 is 24053125.

It can be written as a sum of positive squares in 2 ways, for example, as 372412804 + 148937616 = 19298^2 + 12204^2 .

It is a junction number, because it is equal to n+sod(n) for n = 521350391 and 521350400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13033741 + ... + 13033780.

It is an arithmetic number, because the mean of its divisors is an integer number (91236327).

Almost surely, 2^521350420 is an apocalyptic number.

It is an amenable number.

521350420 is an abundant number, since it is smaller than the sum of its proper divisors (573485504).

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

521350420 is a wasteful number, since it uses less digits than its factorization.

521350420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26067530 (or 26067528 counting only the distinct ones).

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

The square root of 521350420 is about 22833.0992202110. The cubic root of 521350420 is about 804.8406613377.

The spelling of 521350420 in words is "five hundred twenty-one million, three hundred fifty thousand, four hundred twenty".