21611775276023 has 2 divisors, whose sum is σ = 21611775276024. Its totient is φ = 21611775276022.

The previous prime is 21611775276017. The next prime is 21611775276037. The reversal of 21611775276023 is 32067257711612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21611775276023 - 2¹⁸ = 21611775013879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21611705276023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10805887638011 + 10805887638012.

It is an arithmetic number, because the mean of its divisors is an integer number (10805887638012).

Almost surely, 2^{21611775276023} is an apocalyptic number.

21611775276023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21611775276023 is an equidigital number, since it uses as much as digits as its factorization.

21611775276023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1481760, while the sum is 50.

The spelling of 21611775276023 in words is "twenty-one trillion, six hundred eleven billion, seven hundred seventy-five million, two hundred seventy-six thousand, twenty-three".