21715827266 has 16 divisors (see below), whose sum is σ = 38019200256. Its totient is φ = 9108766176.

The previous prime is 21715827253. The next prime is 21715827283. The reversal of 21715827266 is 66272851712.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a self number, because there is not a number n which added to its sum of digits gives 21715827266.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16500731 + ... + 16502046.

It is an arithmetic number, because the mean of its divisors is an integer number (2376200016).

Almost surely, 2^21715827266 is an apocalyptic number.

21715827266 is a deficient number, since it is larger than the sum of its proper divisors (16303372990).

21715827266 is a wasteful number, since it uses less digits than its factorization.

21715827266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33002833.

The product of its digits is 564480, while the sum is 47.

The spelling of 21715827266 in words is "twenty-one billion, seven hundred fifteen million, eight hundred twenty-seven thousand, two hundred sixty-six".