1304400233521 has 24 divisors (see below), whose sum is σ = 1667941688160. Its totient is φ = 1008656812800.

The previous prime is 1304400233489. The next prime is 1304400233527. The reversal of 1304400233521 is 1253320044031.

It is a happy number.

It is not a de Polignac number, because 1304400233521 - 2⁵ = 1304400233489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1304400233521.

It is not an unprimeable number, because it can be changed into a prime (1304400233527) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9166176 + ... + 9307393.

It is an arithmetic number, because the mean of its divisors is an integer number (69497570340).

Almost surely, 2^{1304400233521} is an apocalyptic number.

1304400233521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1304400233521 is a deficient number, since it is larger than the sum of its proper divisors (363541454639).

1304400233521 is a wasteful number, since it uses less digits than its factorization.

1304400233521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18473725 (or 18473718 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 1304400233521 its reverse (1253320044031), we get a palindrome (2557720277552).

The spelling of 1304400233521 in words is "one trillion, three hundred four billion, four hundred million, two hundred thirty-three thousand, five hundred twenty-one".