23556821941 has 2 divisors, whose sum is σ = 23556821942. Its totient is φ = 23556821940.

The previous prime is 23556821929. The next prime is 23556821957. The reversal of 23556821941 is 14912865532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23193767025 + 363054916 = 152295^2 + 19054^2 .

It is a cyclic number.

It is not a de Polignac number, because 23556821941 - 2¹¹ = 23556819893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23556821891 and 23556821900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23556827941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11778410970 + 11778410971.

It is an arithmetic number, because the mean of its divisors is an integer number (11778410971).

Almost surely, 2^23556821941 is an apocalyptic number.

It is an amenable number.

23556821941 is a deficient number, since it is larger than the sum of its proper divisors (1).

23556821941 is an equidigital number, since it uses as much as digits as its factorization.

23556821941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 46.

The spelling of 23556821941 in words is "twenty-three billion, five hundred fifty-six million, eight hundred twenty-one thousand, nine hundred forty-one".