23212478813 has 2 divisors, whose sum is σ = 23212478814. Its totient is φ = 23212478812.

The previous prime is 23212478803. The next prime is 23212478819. The reversal of 23212478813 is 31887421232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16755231364 + 6457247449 = 129442^2 + 80357^2 .

It is a cyclic number.

It is not a de Polignac number, because 23212478813 - 2⁶ = 23212478749 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23212478819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11606239406 + 11606239407.

It is an arithmetic number, because the mean of its divisors is an integer number (11606239407).

Almost surely, 2^23212478813 is an apocalyptic number.

It is an amenable number.

23212478813 is a deficient number, since it is larger than the sum of its proper divisors (1).

23212478813 is an equidigital number, since it uses as much as digits as its factorization.

23212478813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 41.

The spelling of 23212478813 in words is "twenty-three billion, two hundred twelve million, four hundred seventy-eight thousand, eight hundred thirteen".