2131255121 has 2 divisors, whose sum is σ = 2131255122. Its totient is φ = 2131255120.

The previous prime is 2131255117. The next prime is 2131255151. The reversal of 2131255121 is 1215521312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1623203521 + 508051600 = 40289^2 + 22540^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131255121 - 2² = 2131255117 is a prime.

It is not a weakly prime, because it can be changed into another prime (2131255151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065627560 + 1065627561.

It is an arithmetic number, because the mean of its divisors is an integer number (1065627561).

Almost surely, 2^2131255121 is an apocalyptic number.

It is an amenable number.

2131255121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131255121 is an equidigital number, since it uses as much as digits as its factorization.

2131255121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 600, while the sum is 23.

The square root of 2131255121 is about 46165.5187450547. The cubic root of 2131255121 is about 1286.9010245056.

Adding to 2131255121 its reverse (1215521312), we get a palindrome (3346776433).

The spelling of 2131255121 in words is "two billion, one hundred thirty-one million, two hundred fifty-five thousand, one hundred twenty-one".