21616961595 has 8 divisors (see below), whose sum is σ = 34587138576. Its totient is φ = 11529046176.

The previous prime is 21616961593. The next prime is 21616961621. The reversal of 21616961595 is 59516961612.

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

It is not a de Polignac number, because 21616961595 - 2¹ = 21616961593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21616961593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 720565372 + ... + 720565401.

It is an arithmetic number, because the mean of its divisors is an integer number (4323392322).

Almost surely, 2^21616961595 is an apocalyptic number.

21616961595 is a deficient number, since it is larger than the sum of its proper divisors (12970176981).

21616961595 is a wasteful number, since it uses less digits than its factorization.

21616961595 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441130781.

The product of its digits is 874800, while the sum is 51.

The spelling of 21616961595 in words is "twenty-one billion, six hundred sixteen million, nine hundred sixty-one thousand, five hundred ninety-five".