21445983879 has 8 divisors (see below), whose sum is σ = 28915933680. Its totient is φ = 14136678336.

The previous prime is 21445983877. The next prime is 21445983883. The reversal of 21445983879 is 97838954412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21445983879 - 2¹ = 21445983877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21445983877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40160752 + ... + 40161285.

It is an arithmetic number, because the mean of its divisors is an integer number (3614491710).

Almost surely, 2^21445983879 is an apocalyptic number.

21445983879 is a deficient number, since it is larger than the sum of its proper divisors (7469949801).

21445983879 is an equidigital number, since it uses as much as digits as its factorization.

21445983879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80322129.

The product of its digits is 17418240, while the sum is 60.

The spelling of 21445983879 in words is "twenty-one billion, four hundred forty-five million, nine hundred eighty-three thousand, eight hundred seventy-nine".