21611167762523 has 2 divisors, whose sum is σ = 21611167762524. Its totient is φ = 21611167762522.

The previous prime is 21611167762487. The next prime is 21611167762531. The reversal of 21611167762523 is 32526776111612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21611167762523 - 2¹⁴ = 21611167746139 is a prime.

It is not a weakly prime, because it can be changed into another prime (21611167762573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10805583881261 + 10805583881262.

It is an arithmetic number, because the mean of its divisors is an integer number (10805583881262).

Almost surely, 2^{21611167762523} is an apocalyptic number.

21611167762523 is a deficient number, since it is larger than the sum of its proper divisors (1).

21611167762523 is an equidigital number, since it uses as much as digits as its factorization.

21611167762523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 50.

The spelling of 21611167762523 in words is "twenty-one trillion, six hundred eleven billion, one hundred sixty-seven million, seven hundred sixty-two thousand, five hundred twenty-three".