213213131 has 4 divisors (see below), whose sum is σ = 213339600. Its totient is φ = 213086664.

The previous prime is 213213127. The next prime is 213213157. The reversal of 213213131 is 131312312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213213131 - 2² = 213213127 is a prime.

It is a super-2 number, since 2×213213131² = 90919678461646322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213213181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60671 + ... + 64088.

It is an arithmetic number, because the mean of its divisors is an integer number (53334900).

Almost surely, 2^213213131 is an apocalyptic number.

213213131 is a deficient number, since it is larger than the sum of its proper divisors (126469).

213213131 is a wasteful number, since it uses less digits than its factorization.

213213131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126468.

The product of its digits is 108, while the sum is 17.

The square root of 213213131 is about 14601.8194414258. The cubic root of 213213131 is about 597.4083877679.

Adding to 213213131 its reverse (131312312), we get a palindrome (344525443).

The spelling of 213213131 in words is "two hundred thirteen million, two hundred thirteen thousand, one hundred thirty-one".