2131231001099 has 2 divisors, whose sum is σ = 2131231001100. Its totient is φ = 2131231001098.

The previous prime is 2131231001069. The next prime is 2131231001101. The reversal of 2131231001099 is 9901001321312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2131231001099 is a prime.

It is a Sophie Germain prime.

Together with 2131231001101, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2131231001069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065615500549 + 1065615500550.

It is an arithmetic number, because the mean of its divisors is an integer number (1065615500550).

Almost surely, 2^{2131231001099} is an apocalyptic number.

2131231001099 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131231001099 is an equidigital number, since it uses as much as digits as its factorization.

2131231001099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 32.

The spelling of 2131231001099 in words is "two trillion, one hundred thirty-one billion, two hundred thirty-one million, one thousand, ninety-nine".