21116355023 has 2 divisors, whose sum is σ = 21116355024. Its totient is φ = 21116355022.

The previous prime is 21116354983. The next prime is 21116355031. The reversal of 21116355023 is 32055361112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21116355023 - 2³² = 16821387727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21116355523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10558177511 + 10558177512.

It is an arithmetic number, because the mean of its divisors is an integer number (10558177512).

Almost surely, 2^21116355023 is an apocalyptic number.

21116355023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21116355023 is an equidigital number, since it uses as much as digits as its factorization.

21116355023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The spelling of 21116355023 in words is "twenty-one billion, one hundred sixteen million, three hundred fifty-five thousand, twenty-three".