21611167711423 has 2 divisors, whose sum is σ = 21611167711424. Its totient is φ = 21611167711422.

The previous prime is 21611167711417. The next prime is 21611167711453. The reversal of 21611167711423 is 32411776111612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21611167711423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21611167711423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21611167711453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10805583855711 + 10805583855712.

It is an arithmetic number, because the mean of its divisors is an integer number (10805583855712).

Almost surely, 2^{21611167711423} is an apocalyptic number.

21611167711423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21611167711423 is an equidigital number, since it uses as much as digits as its factorization.

21611167711423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 43.

The spelling of 21611167711423 in words is "twenty-one trillion, six hundred eleven billion, one hundred sixty-seven million, seven hundred eleven thousand, four hundred twenty-three".