21386596385 has 16 divisors (see below), whose sum is σ = 31996570752. Its totient is φ = 13331904000.

The previous prime is 21386596367. The next prime is 21386596393. The reversal of 21386596385 is 58369568312.

It is not a de Polignac number, because 21386596385 - 2²⁰ = 21385547809 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 21386596385.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27774416 + ... + 27775185.

It is an arithmetic number, because the mean of its divisors is an integer number (1999785672).

Almost surely, 2^21386596385 is an apocalyptic number.

It is an amenable number.

21386596385 is a deficient number, since it is larger than the sum of its proper divisors (10609974367).

21386596385 is a wasteful number, since it uses less digits than its factorization.

21386596385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55549624.

The product of its digits is 9331200, while the sum is 56.

The spelling of 21386596385 in words is "twenty-one billion, three hundred eighty-six million, five hundred ninety-six thousand, three hundred eighty-five".