213122133231 has 32 divisors (see below), whose sum is σ = 334951262208. Its totient is φ = 118012742400.

The previous prime is 213122133229. The next prime is 213122133253. The reversal of 213122133231 is 132331221312.

It is not a de Polignac number, because 213122133231 - 2¹ = 213122133229 is a prime.

It is a super-2 number, since 2×213122133231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213122133281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 969270 + ... + 1168643.

It is an arithmetic number, because the mean of its divisors is an integer number (10467226944).

Almost surely, 2^213122133231 is an apocalyptic number.

213122133231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

213122133231 is a deficient number, since it is larger than the sum of its proper divisors (121829128977).

213122133231 is a wasteful number, since it uses less digits than its factorization.

213122133231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2138071.

The product of its digits is 1296, while the sum is 24.

Adding to 213122133231 its reverse (132331221312), we get a palindrome (345453354543).

The spelling of 213122133231 in words is "two hundred thirteen billion, one hundred twenty-two million, one hundred thirty-three thousand, two hundred thirty-one".