23156187121 has 2 divisors, whose sum is σ = 23156187122. Its totient is φ = 23156187120.

The previous prime is 23156187077. The next prime is 23156187137. The reversal of 23156187121 is 12178165132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23145058225 + 11128896 = 152135^2 + 3336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23156187121 is a prime.

It is not a weakly prime, because it can be changed into another prime (23156187221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11578093560 + 11578093561.

It is an arithmetic number, because the mean of its divisors is an integer number (11578093561).

Almost surely, 2^23156187121 is an apocalyptic number.

It is an amenable number.

23156187121 is a deficient number, since it is larger than the sum of its proper divisors (1).

23156187121 is an equidigital number, since it uses as much as digits as its factorization.

23156187121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 37.

The spelling of 23156187121 in words is "twenty-three billion, one hundred fifty-six million, one hundred eighty-seven thousand, one hundred twenty-one".