23431105021 has 2 divisors, whose sum is σ = 23431105022. Its totient is φ = 23431105020.

The previous prime is 23431104989. The next prime is 23431105051. The reversal of 23431105021 is 12050113432.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15803004100 + 7628100921 = 125710^2 + 87339^2 .

It is a cyclic number.

It is not a de Polignac number, because 23431105021 - 2⁵ = 23431104989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23431104983 and 23431105001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23431105051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11715552510 + 11715552511.

It is an arithmetic number, because the mean of its divisors is an integer number (11715552511).

Almost surely, 2^23431105021 is an apocalyptic number.

It is an amenable number.

23431105021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23431105021 is an equidigital number, since it uses as much as digits as its factorization.

23431105021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 23431105021 its reverse (12050113432), we get a palindrome (35481218453).

The spelling of 23431105021 in words is "twenty-three billion, four hundred thirty-one million, one hundred five thousand, twenty-one".