2131220131 has 2 divisors, whose sum is σ = 2131220132. Its totient is φ = 2131220130.

The previous prime is 2131220083. The next prime is 2131220213. The reversal of 2131220131 is 1310221312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2131220131 - 2⁹ = 2131219619 is a prime.

It is a super-2 number, since 2×2131220131² = 9084198493559314322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2131220431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065610065 + 1065610066.

It is an arithmetic number, because the mean of its divisors is an integer number (1065610066).

Almost surely, 2^2131220131 is an apocalyptic number.

2131220131 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131220131 is an equidigital number, since it uses as much as digits as its factorization.

2131220131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2131220131 is about 46165.1397810079. The cubic root of 2131220131 is about 1286.8939818773.

Adding to 2131220131 its reverse (1310221312), we get a palindrome (3441441443).

The spelling of 2131220131 in words is "two billion, one hundred thirty-one million, two hundred twenty thousand, one hundred thirty-one".