21111718373023 has 2 divisors, whose sum is σ = 21111718373024. Its totient is φ = 21111718373022.

The previous prime is 21111718372993. The next prime is 21111718373047. The reversal of 21111718373023 is 32037381711112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21111718373023 - 2²⁵ = 21111684818591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111718373723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555859186511 + 10555859186512.

It is an arithmetic number, because the mean of its divisors is an integer number (10555859186512).

Almost surely, 2^{21111718373023} is an apocalyptic number.

21111718373023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111718373023 is an equidigital number, since it uses as much as digits as its factorization.

21111718373023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 40.

The spelling of 21111718373023 in words is "twenty-one trillion, one hundred eleven billion, seven hundred eighteen million, three hundred seventy-three thousand, twenty-three".