213131212 has 24 divisors (see below), whose sum is σ = 426594560. Its totient is φ = 91270800.

The previous prime is 213131209. The next prime is 213131249. The reversal of 213131212 is 212131312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50587 + ... + 54637.

Almost surely, 2^213131212 is an apocalyptic number.

It is an amenable number.

213131212 is an abundant number, since it is smaller than the sum of its proper divisors (213463348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213131212 is a wasteful number, since it uses less digits than its factorization.

213131212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5941 (or 5939 counting only the distinct ones).

The product of its digits is 72, while the sum is 16.

The square root of 213131212 is about 14599.0140762998. The cubic root of 213131212 is about 597.3318675172.

Adding to 213131212 its reverse (212131312), we get a palindrome (425262524).

The spelling of 213131212 in words is "two hundred thirteen million, one hundred thirty-one thousand, two hundred twelve".