21979748805285 has 32 divisors (see below), whose sum is σ = 35881707552768. Its totient is φ = 11486522053440.

The previous prime is 21979748805271. The next prime is 21979748805349. The reversal of 21979748805285 is 58250884797912.

It is not a de Polignac number, because 21979748805285 - 2¹¹ = 21979748803237 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63133957 + ... + 63481146.

It is an arithmetic number, because the mean of its divisors is an integer number (1121303361024).

Almost surely, 2^{21979748805285} is an apocalyptic number.

It is an amenable number.

21979748805285 is a deficient number, since it is larger than the sum of its proper divisors (13901958747483).

21979748805285 is a wasteful number, since it uses less digits than its factorization.

21979748805285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126615345.

The product of its (nonzero) digits is 812851200, while the sum is 75.

The spelling of 21979748805285 in words is "twenty-one trillion, nine hundred seventy-nine billion, seven hundred forty-eight million, eight hundred five thousand, two hundred eighty-five".