213220131 has 16 divisors (see below), whose sum is σ = 294927360. Its totient is φ = 136918080.

The previous prime is 213220127. The next prime is 213220177. The reversal of 213220131 is 131022312.

It is not a de Polignac number, because 213220131 - 2² = 213220127 is a prime.

It is a super-2 number, since 2×213220131² = 90925648527314322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 213220131.

It is not an unprimeable number, because it can be changed into a prime (213220181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1255 + ... + 20688.

It is an arithmetic number, because the mean of its divisors is an integer number (18432960).

Almost surely, 2^213220131 is an apocalyptic number.

213220131 is a deficient number, since it is larger than the sum of its proper divisors (81707229).

213220131 is a wasteful number, since it uses less digits than its factorization.

213220131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22066.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 213220131 is about 14602.0591356151. The cubic root of 213220131 is about 597.4149255343.

Adding to 213220131 its reverse (131022312), we get a palindrome (344242443).

The spelling of 213220131 in words is "two hundred thirteen million, two hundred twenty thousand, one hundred thirty-one".