521214404 has 6 divisors (see below), whose sum is σ = 912125214. Its totient is φ = 260607200.

The previous prime is 521214391. The next prime is 521214413. The reversal of 521214404 is 404412125.

It can be written as a sum of positive squares in only one way, i.e., 506160004 + 15054400 = 22498^2 + 3880^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 521214404.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65151797 + ... + 65151804.

It is an arithmetic number, because the mean of its divisors is an integer number (152020869).

Almost surely, 2^521214404 is an apocalyptic number.

It is an amenable number.

521214404 is a deficient number, since it is larger than the sum of its proper divisors (390910810).

521214404 is a wasteful number, since it uses less digits than its factorization.

521214404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130303605 (or 130303603 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 521214404 is about 22830.1205428268. The cubic root of 521214404 is about 804.7706631659.

Adding to 521214404 its reverse (404412125), we get a palindrome (925626529).

The spelling of 521214404 in words is "five hundred twenty-one million, two hundred fourteen thousand, four hundred four".