21712366566023 has 4 divisors (see below), whose sum is σ = 24814133218320. Its totient is φ = 18610599913728.

The previous prime is 21712366565917. The next prime is 21712366566029. The reversal of 21712366566023 is 32066566321712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21712366566023 - 2¹² = 21712366561927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21712366566029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1550883326138 + ... + 1550883326151.

It is an arithmetic number, because the mean of its divisors is an integer number (6203533304580).

Almost surely, 2^{21712366566023} is an apocalyptic number.

21712366566023 is a deficient number, since it is larger than the sum of its proper divisors (3101766652297).

21712366566023 is an equidigital number, since it uses as much as digits as its factorization.

21712366566023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3101766652296.

The product of its (nonzero) digits is 3265920, while the sum is 50.

The spelling of 21712366566023 in words is "twenty-one trillion, seven hundred twelve billion, three hundred sixty-six million, five hundred sixty-six thousand, twenty-three".