2131231213 has 2 divisors, whose sum is σ = 2131231214. Its totient is φ = 2131231212.

The previous prime is 2131231187. The next prime is 2131231229. The reversal of 2131231213 is 3121321312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2035543689 + 95687524 = 45117^2 + 9782^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131231213 - 2⁵ = 2131231181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131231253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065615606 + 1065615607.

It is an arithmetic number, because the mean of its divisors is an integer number (1065615607).

Almost surely, 2^2131231213 is an apocalyptic number.

It is an amenable number.

2131231213 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131231213 is an equidigital number, since it uses as much as digits as its factorization.

2131231213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 19.

The square root of 2131231213 is about 46165.2598064822. The cubic root of 2131231213 is about 1286.8962124203.

Adding to 2131231213 its reverse (3121321312), we get a palindrome (5252552525).

Subtracting 2131231213 from its reverse (3121321312), we obtain a palindrome (990090099).

It can be divided in two parts, 21312 and 31213, that added together give a palindrome (52525).

The spelling of 2131231213 in words is "two billion, one hundred thirty-one million, two hundred thirty-one thousand, two hundred thirteen".