23887163221 has 2 divisors, whose sum is σ = 23887163222. Its totient is φ = 23887163220.

The previous prime is 23887163219. The next prime is 23887163227. The reversal of 23887163221 is 12236178832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23375046321 + 512116900 = 152889^2 + 22630^2 .

It is a cyclic number.

It is not a de Polignac number, because 23887163221 - 2¹ = 23887163219 is a prime.

Together with 23887163219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23887163227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11943581610 + 11943581611.

It is an arithmetic number, because the mean of its divisors is an integer number (11943581611).

Almost surely, 2^23887163221 is an apocalyptic number.

It is an amenable number.

23887163221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23887163221 is an equidigital number, since it uses as much as digits as its factorization.

23887163221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 43.

The spelling of 23887163221 in words is "twenty-three billion, eight hundred eighty-seven million, one hundred sixty-three thousand, two hundred twenty-one".