213431337 has 12 divisors (see below), whose sum is σ = 352331200. Its totient is φ = 121960728.

The previous prime is 213431321. The next prime is 213431359. The reversal of 213431337 is 733134312.

It is not a de Polignac number, because 213431337 - 2⁴ = 213431321 is a prime.

It is a super-2 number, since 2×213431337² = 91105871227215138, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213431337.

It is not an unprimeable number, because it can be changed into a prime (213431737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1693837 + ... + 1693962.

Almost surely, 2^213431337 is an apocalyptic number.

It is an amenable number.

213431337 is a deficient number, since it is larger than the sum of its proper divisors (138899863).

213431337 is a wasteful number, since it uses less digits than its factorization.

213431337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3387812 (or 3387809 counting only the distinct ones).

The product of its digits is 4536, while the sum is 27.

The square root of 213431337 is about 14609.2894077707. The cubic root of 213431337 is about 597.6121176368.

Adding to 213431337 its reverse (733134312), we get a palindrome (946565649).

The spelling of 213431337 in words is "two hundred thirteen million, four hundred thirty-one thousand, three hundred thirty-seven".