213222231 has 12 divisors (see below), whose sum is σ = 316312152. Its totient is φ = 138306096.

The previous prime is 213222227. The next prime is 213222271. The reversal of 213222231 is 132222312.

213222231 is a `hidden beast` number, since 213 + 222 + 231 = 666.

It is not a de Polignac number, because 213222231 - 2² = 213222227 is a prime.

It is a super-2 number, since 2×213222231² = 90927439585234722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213222271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 319821 + ... + 320486.

It is an arithmetic number, because the mean of its divisors is an integer number (26359346).

Almost surely, 2^213222231 is an apocalyptic number.

213222231 is a deficient number, since it is larger than the sum of its proper divisors (103089921).

213222231 is a wasteful number, since it uses less digits than its factorization.

213222231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640350 (or 640347 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 213222231 is about 14602.1310431046. The cubic root of 213222231 is about 597.4168868363.

Adding to 213222231 its reverse (132222312), we get a palindrome (345444543).

It can be divided in two parts, 2 and 13222231, that multiplied together give a palindrome (26444462).

The spelling of 213222231 in words is "two hundred thirteen million, two hundred twenty-two thousand, two hundred thirty-one".