21345756895 has 16 divisors (see below), whose sum is σ = 25795626048. Its totient is φ = 16956276480.

The previous prime is 21345756889. The next prime is 21345756919. The reversal of 21345756895 is 59865754312.

It is not a de Polignac number, because 21345756895 - 2¹⁷ = 21345625823 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 15 ways as a sum of consecutive naturals, for example, 1253035 + ... + 1269955.

It is an arithmetic number, because the mean of its divisors is an integer number (1612226628).

Almost surely, 2^21345756895 is an apocalyptic number.

21345756895 is a deficient number, since it is larger than the sum of its proper divisors (4449869153).

21345756895 is a wasteful number, since it uses less digits than its factorization.

21345756895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18690.

The product of its digits is 9072000, while the sum is 55.

The spelling of 21345756895 in words is "twenty-one billion, three hundred forty-five million, seven hundred fifty-six thousand, eight hundred ninety-five".