521022004 has 12 divisors (see below), whose sum is σ = 943229700. Its totient is φ = 251527808.

The previous prime is 521021989. The next prime is 521022023. The reversal of 521022004 is 400220125.

It can be written as a sum of positive squares in 2 ways, for example, as 253764900 + 267257104 = 15930^2 + 16348^2 .

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, 2245669 + ... + 2245900.

It is an arithmetic number, because the mean of its divisors is an integer number (78602475).

Almost surely, 2^521022004 is an apocalyptic number.

It is an amenable number.

521022004 is a deficient number, since it is larger than the sum of its proper divisors (422207696).

521022004 is a wasteful number, since it uses less digits than its factorization.

521022004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4491602 (or 4491600 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 521022004 is about 22825.9064223088. The cubic root of 521022004 is about 804.6716271898.

Adding to 521022004 its reverse (400220125), we get a palindrome (921242129).

The spelling of 521022004 in words is "five hundred twenty-one million, twenty-two thousand, four".