21391195285 has 16 divisors (see below), whose sum is σ = 27183340800. Its totient is φ = 16103977216.

The previous prime is 21391195279. The next prime is 21391195297. The reversal of 21391195285 is 58259119312.

It is a cyclic number.

It is not a de Polignac number, because 21391195285 - 2⁵ = 21391195253 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 771696 + ... + 798934.

It is an arithmetic number, because the mean of its divisors is an integer number (1698958800).

Almost surely, 2^21391195285 is an apocalyptic number.

It is an amenable number.

21391195285 is a deficient number, since it is larger than the sum of its proper divisors (5792145515).

21391195285 is a wasteful number, since it uses less digits than its factorization.

21391195285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36500.

The product of its digits is 194400, while the sum is 46.

The spelling of 21391195285 in words is "twenty-one billion, three hundred ninety-one million, one hundred ninety-five thousand, two hundred eighty-five".