521241404 has 24 divisors (see below), whose sum is σ = 918095808. Its totient is φ = 258935040.

The previous prime is 521241397. The next prime is 521241407. The reversal of 521241404 is 404142125.

It is a self number, because there is not a number n which added to its sum of digits gives 521241404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521241407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 571709 + ... + 572619.

It is an arithmetic number, because the mean of its divisors is an integer number (38253992).

Almost surely, 2^521241404 is an apocalyptic number.

It is an amenable number.

521241404 is a deficient number, since it is larger than the sum of its proper divisors (396854404).

521241404 is a wasteful number, since it uses less digits than its factorization.

521241404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685 (or 1683 counting only the distinct ones).

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

The square root of 521241404 is about 22830.7118592478. The cubic root of 521241404 is about 804.7845591957.

Adding to 521241404 its reverse (404142125), we get a palindrome (925383529).

The spelling of 521241404 in words is "five hundred twenty-one million, two hundred forty-one thousand, four hundred four".