231321121099 has 2 divisors, whose sum is σ = 231321121100. Its totient is φ = 231321121098.

The previous prime is 231321121079. The next prime is 231321121117. The reversal of 231321121099 is 990121123132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231321121099 - 2⁹ = 231321120587 is a prime.

It is a super-2 number, since 2×231321121099² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231321121019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115660560549 + 115660560550.

It is an arithmetic number, because the mean of its divisors is an integer number (115660560550).

Almost surely, 2^231321121099 is an apocalyptic number.

231321121099 is a deficient number, since it is larger than the sum of its proper divisors (1).

231321121099 is an equidigital number, since it uses as much as digits as its factorization.

231321121099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 34.

The spelling of 231321121099 in words is "two hundred thirty-one billion, three hundred twenty-one million, one hundred twenty-one thousand, ninety-nine".