402044038201521 has 6 divisors (see below), whose sum is σ = 580730277402210. Its totient is φ = 268029358801008.

The previous prime is 402044038201459. The next prime is 402044038201571. The reversal of 402044038201521 is 125102830440204.

402044038201521 is a `hidden beast` number, since 4 + 0 + 2 + 0 + 440 + 3 + 8 + 201 + 5 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 220957522329600 + 181086515871921 = 14864640^2 + 13456839^2 .

It is not a de Polignac number, because 402044038201521 - 2⁶ = 402044038201457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (402044038201571) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22335779900076 + ... + 22335779900093.

It is an arithmetic number, because the mean of its divisors is an integer number (96788379567035).

Almost surely, 2^{402044038201521} is an apocalyptic number.

It is an amenable number.

402044038201521 is a deficient number, since it is larger than the sum of its proper divisors (178686239200689).

402044038201521 is a wasteful number, since it uses less digits than its factorization.

402044038201521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44671559800175 (or 44671559800172 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 36.

Adding to 402044038201521 its reverse (125102830440204), we get a palindrome (527146868641725).

The spelling of 402044038201521 in words is "four hundred two trillion, forty-four billion, thirty-eight million, two hundred one thousand, five hundred twenty-one".