521420204 has 6 divisors (see below), whose sum is σ = 912485364. Its totient is φ = 260710100.

The previous prime is 521420177. The next prime is 521420227. The reversal of 521420204 is 402024125.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65177522 + ... + 65177529.

It is an arithmetic number, because the mean of its divisors is an integer number (152080894).

Almost surely, 2^521420204 is an apocalyptic number.

It is an amenable number.

521420204 is a deficient number, since it is larger than the sum of its proper divisors (391065160).

521420204 is a wasteful number, since it uses less digits than its factorization.

521420204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130355055 (or 130355053 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 521420204 is about 22834.6273015348. The cubic root of 521420204 is about 804.8765696844.

Adding to 521420204 its reverse (402024125), we get a palindrome (923444329).

The spelling of 521420204 in words is "five hundred twenty-one million, four hundred twenty thousand, two hundred four".