21979588285 has 8 divisors (see below), whose sum is σ = 26377305696. Its totient is φ = 17582470800.

The previous prime is 21979588223. The next prime is 21979588313. The reversal of 21979588285 is 58288597912.

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

It is a de Polignac number, because none of the positive numbers 2^k-21979588285 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 64999 + ... + 219508.

It is an arithmetic number, because the mean of its divisors is an integer number (3297163212).

Almost surely, 2^21979588285 is an apocalyptic number.

It is an amenable number.

21979588285 is a deficient number, since it is larger than the sum of its proper divisors (4397717411).

21979588285 is a wasteful number, since it uses less digits than its factorization.

21979588285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299963.

The product of its digits is 29030400, while the sum is 64.

The spelling of 21979588285 in words is "twenty-one billion, nine hundred seventy-nine million, five hundred eighty-eight thousand, two hundred eighty-five".