23100001209991 has 2 divisors, whose sum is σ = 23100001209992. Its totient is φ = 23100001209990.

The previous prime is 23100001209959. The next prime is 23100001210001. The reversal of 23100001209991 is 19990210000132.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23100001209991 - 2⁵ = 23100001209959 is a prime.

It is a super-2 number, since 2×23100001209991² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23100001209991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23100001206991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11550000604995 + 11550000604996.

It is an arithmetic number, because the mean of its divisors is an integer number (11550000604996).

Almost surely, 2^{23100001209991} is an apocalyptic number.

23100001209991 is a deficient number, since it is larger than the sum of its proper divisors (1).

23100001209991 is an equidigital number, since it uses as much as digits as its factorization.

23100001209991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 37.

The spelling of 23100001209991 in words is "twenty-three trillion, one hundred billion, one million, two hundred nine thousand, nine hundred ninety-one".