213131222 has 4 divisors (see below), whose sum is σ = 319696836. Its totient is φ = 106565610.

The previous prime is 213131209. The next prime is 213131249. The reversal of 213131222 is 222131312.

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

It is a self number, because there is not a number n which added to its sum of digits gives 213131222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53282804 + ... + 53282807.

It is an arithmetic number, because the mean of its divisors is an integer number (79924209).

Almost surely, 2^213131222 is an apocalyptic number.

213131222 is a deficient number, since it is larger than the sum of its proper divisors (106565614).

213131222 is a wasteful number, since it uses less digits than its factorization.

213131222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106565613.

The product of its digits is 144, while the sum is 17.

The square root of 213131222 is about 14599.0144187887. The cubic root of 213131222 is about 597.3318768593.

Adding to 213131222 its reverse (222131312), we get a palindrome (435262534).

It can be divided in two parts, 2131312 and 22, that multiplied together give a palindrome (46888864).

The spelling of 213131222 in words is "two hundred thirteen million, one hundred thirty-one thousand, two hundred twenty-two".