123310021091 has 2 divisors, whose sum is σ = 123310021092. Its totient is φ = 123310021090.

The previous prime is 123310021061. The next prime is 123310021099. The reversal of 123310021091 is 190120013321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123310021091 is a prime.

It is a super-2 number, since 2×123310021091² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (123310021099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61655010545 + 61655010546.

It is an arithmetic number, because the mean of its divisors is an integer number (61655010546).

Almost surely, 2^123310021091 is an apocalyptic number.

123310021091 is a deficient number, since it is larger than the sum of its proper divisors (1).

123310021091 is an equidigital number, since it uses as much as digits as its factorization.

123310021091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The spelling of 123310021091 in words is "one hundred twenty-three billion, three hundred ten million, twenty-one thousand, ninety-one".