213131404 has 6 divisors (see below), whose sum is σ = 372979964. Its totient is φ = 106565700.

The previous prime is 213131393. The next prime is 213131437. The reversal of 213131404 is 404131312.

It is a super-2 number, since 2×213131404² = 90849990742022432, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26641422 + ... + 26641429.

Almost surely, 2^213131404 is an apocalyptic number.

It is an amenable number.

213131404 is a deficient number, since it is larger than the sum of its proper divisors (159848560).

213131404 is a wasteful number, since it uses less digits than its factorization.

213131404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53282855 (or 53282853 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 213131404 is about 14599.0206520849. The cubic root of 213131404 is about 597.3320468866.

Adding to 213131404 its reverse (404131312), we get a palindrome (617262716).

The spelling of 213131404 in words is "two hundred thirteen million, one hundred thirty-one thousand, four hundred four".