21726279364607 has 4 divisors (see below), whose sum is σ = 21728612773056. Its totient is φ = 21723945956160.

The previous prime is 21726279364507. The next prime is 21726279364613. The reversal of 21726279364607 is 70646397262712.

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 21726279364607 - 2¹⁴ = 21726279348223 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21726279364607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21726279364667) 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, 1166690258 + ... + 1166708879.

It is an arithmetic number, because the mean of its divisors is an integer number (5432153193264).

Almost surely, 2^{21726279364607} is an apocalyptic number.

21726279364607 is a deficient number, since it is larger than the sum of its proper divisors (2333408449).

21726279364607 is an equidigital number, since it uses as much as digits as its factorization.

21726279364607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333408448.

The product of its (nonzero) digits is 64012032, while the sum is 62.

The spelling of 21726279364607 in words is "twenty-one trillion, seven hundred twenty-six billion, two hundred seventy-nine million, three hundred sixty-four thousand, six hundred seven".