213226231 has 2 divisors, whose sum is σ = 213226232. Its totient is φ = 213226230.

The previous prime is 213226229. The next prime is 213226249. The reversal of 213226231 is 132622312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213226231 - 2¹ = 213226229 is a prime.

It is a super-2 number, since 2×213226231² = 90930851172930722, which contains 22 as substring.

Together with 213226229, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213226201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106613115 + 106613116.

It is an arithmetic number, because the mean of its divisors is an integer number (106613116).

Almost surely, 2^213226231 is an apocalyptic number.

213226231 is a deficient number, since it is larger than the sum of its proper divisors (1).

213226231 is an equidigital number, since it uses as much as digits as its factorization.

213226231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 22.

The square root of 213226231 is about 14602.2680087718. The cubic root of 213226231 is about 597.4206226141.

Adding to 213226231 its reverse (132622312), we get a palindrome (345848543).

The spelling of 213226231 in words is "two hundred thirteen million, two hundred twenty-six thousand, two hundred thirty-one".