23231321081 has 2 divisors, whose sum is σ = 23231321082. Its totient is φ = 23231321080.

The previous prime is 23231321077. The next prime is 23231321101. The reversal of 23231321081 is 18012313232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12647026681 + 10584294400 = 112459^2 + 102880^2 .

It is a cyclic number.

It is not a de Polignac number, because 23231321081 - 2² = 23231321077 is a prime.

It is a super-2 number, since 2×23231321081² (a number of 22 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 23231321081.

It is not a weakly prime, because it can be changed into another prime (23231321021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11615660540 + 11615660541.

It is an arithmetic number, because the mean of its divisors is an integer number (11615660541).

Almost surely, 2^23231321081 is an apocalyptic number.

It is an amenable number.

23231321081 is a deficient number, since it is larger than the sum of its proper divisors (1).

23231321081 is an equidigital number, since it uses as much as digits as its factorization.

23231321081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The spelling of 23231321081 in words is "twenty-three billion, two hundred thirty-one million, three hundred twenty-one thousand, eighty-one".