213131231231 has 2 divisors, whose sum is σ = 213131231232. Its totient is φ = 213131231230.

The previous prime is 213131231207. The next prime is 213131231297. The reversal of 213131231231 is 132132131312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213131231231 - 2⁶ = 213131231167 is a prime.

It is a super-2 number, since 2×213131231231² (a number of 23 digits) contains 22 as substring.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 213131231197 and 213131231206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213131231531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106565615615 + 106565615616.

It is an arithmetic number, because the mean of its divisors is an integer number (106565615616).

Almost surely, 2^213131231231 is an apocalyptic number.

213131231231 is a deficient number, since it is larger than the sum of its proper divisors (1).

213131231231 is an equidigital number, since it uses as much as digits as its factorization.

213131231231 is an evil number, because the sum of its binary digits is even.

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

Adding to 213131231231 its reverse (132132131312), we get a palindrome (345263362543).

The spelling of 213131231231 in words is "two hundred thirteen billion, one hundred thirty-one million, two hundred thirty-one thousand, two hundred thirty-one".