2131220031121 has 2 divisors, whose sum is σ = 2131220031122. Its totient is φ = 2131220031120.

The previous prime is 2131220031113. The next prime is 2131220031133. The reversal of 2131220031121 is 1211300221312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1152230496400 + 978989534721 = 1073420^2 + 989439^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131220031121 - 2³ = 2131220031113 is a prime.

It is not a weakly prime, because it can be changed into another prime (2131220031151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065610015560 + 1065610015561.

It is an arithmetic number, because the mean of its divisors is an integer number (1065610015561).

Almost surely, 2^{2131220031121} is an apocalyptic number.

It is an amenable number.

2131220031121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131220031121 is an equidigital number, since it uses as much as digits as its factorization.

2131220031121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 2131220031121 its reverse (1211300221312), we get a palindrome (3342520252433).

The spelling of 2131220031121 in words is "two trillion, one hundred thirty-one billion, two hundred twenty million, thirty-one thousand, one hundred twenty-one".