231312213211 has 2 divisors, whose sum is σ = 231312213212. Its totient is φ = 231312213210.

The previous prime is 231312213199. The next prime is 231312213239. The reversal of 231312213211 is 112312213132.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231312213211 is a prime.

It is a super-2 number, since 2×231312213211² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231312213241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115656106605 + 115656106606.

It is an arithmetic number, because the mean of its divisors is an integer number (115656106606).

Almost surely, 2^231312213211 is an apocalyptic number.

231312213211 is a deficient number, since it is larger than the sum of its proper divisors (1).

231312213211 is an equidigital number, since it uses as much as digits as its factorization.

231312213211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 22.

Adding to 231312213211 its reverse (112312213132), we get a palindrome (343624426343).

The spelling of 231312213211 in words is "two hundred thirty-one billion, three hundred twelve million, two hundred thirteen thousand, two hundred eleven".