213113321231 has 2 divisors, whose sum is σ = 213113321232. Its totient is φ = 213113321230.

The previous prime is 213113321221. The next prime is 213113321249. The reversal of 213113321231 is 132123311312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213113321231 - 2²² = 213109126927 is a prime.

It is a super-2 number, since 2×213113321231² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213113321197 and 213113321206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213113321221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106556660615 + 106556660616.

It is an arithmetic number, because the mean of its divisors is an integer number (106556660616).

Almost surely, 2^213113321231 is an apocalyptic number.

213113321231 is a deficient number, since it is larger than the sum of its proper divisors (1).

213113321231 is an equidigital number, since it uses as much as digits as its factorization.

213113321231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 23.

Adding to 213113321231 its reverse (132123311312), we get a palindrome (345236632543).

The spelling of 213113321231 in words is "two hundred thirteen billion, one hundred thirteen million, three hundred twenty-one thousand, two hundred thirty-one".