2131312100987 has 2 divisors, whose sum is σ = 2131312100988. Its totient is φ = 2131312100986.

The previous prime is 2131312100917. The next prime is 2131312101019. The reversal of 2131312100987 is 7890012131312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2131312100987 - 2²⁰ = 2131311052411 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2131312100987.

It is not a weakly prime, because it can be changed into another prime (2131312100917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065656050493 + 1065656050494.

It is an arithmetic number, because the mean of its divisors is an integer number (1065656050494).

Almost surely, 2^{2131312100987} is an apocalyptic number.

2131312100987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131312100987 is an equidigital number, since it uses as much as digits as its factorization.

2131312100987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The spelling of 2131312100987 in words is "two trillion, one hundred thirty-one billion, three hundred twelve million, one hundred thousand, nine hundred eighty-seven".