21617142395 has 8 divisors (see below), whose sum is σ = 25979819280. Its totient is φ = 17267548320.

The previous prime is 21617142377. The next prime is 21617142401. The reversal of 21617142395 is 59324171612.

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

It is not a de Polignac number, because 21617142395 - 2¹⁸ = 21616880251 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 3267065 + ... + 3273674.

It is an arithmetic number, because the mean of its divisors is an integer number (3247477410).

Almost surely, 2^21617142395 is an apocalyptic number.

21617142395 is a deficient number, since it is larger than the sum of its proper divisors (4362676885).

21617142395 is an equidigital number, since it uses as much as digits as its factorization.

21617142395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6541405.

The product of its digits is 90720, while the sum is 41.

The spelling of 21617142395 in words is "twenty-one billion, six hundred seventeen million, one hundred forty-two thousand, three hundred ninety-five".