21116563886623 has 2 divisors, whose sum is σ = 21116563886624. Its totient is φ = 21116563886622.

The previous prime is 21116563886563. The next prime is 21116563886669. The reversal of 21116563886623 is 32668836561112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21116563886623 - 2²¹ = 21116561789471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21116563886023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10558281943311 + 10558281943312.

It is an arithmetic number, because the mean of its divisors is an integer number (10558281943312).

Almost surely, 2^{21116563886623} is an apocalyptic number.

21116563886623 is a deficient number, since it is larger than the sum of its proper divisors (1).

21116563886623 is an equidigital number, since it uses as much as digits as its factorization.

21116563886623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14929920, while the sum is 58.

The spelling of 21116563886623 in words is "twenty-one trillion, one hundred sixteen billion, five hundred sixty-three million, eight hundred eighty-six thousand, six hundred twenty-three".