21852160615 has 4 divisors (see below), whose sum is σ = 26222592744. Its totient is φ = 17481728488.

The previous prime is 21852160571. The next prime is 21852160619. The reversal of 21852160615 is 51606125812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21852160615 - 2²¹ = 21850063463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21852160619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2185216057 + ... + 2185216066.

It is an arithmetic number, because the mean of its divisors is an integer number (6555648186).

Almost surely, 2^21852160615 is an apocalyptic number.

21852160615 is a deficient number, since it is larger than the sum of its proper divisors (4370432129).

21852160615 is an equidigital number, since it uses as much as digits as its factorization.

21852160615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4370432128.

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 21852160615 in words is "twenty-one billion, eight hundred fifty-two million, one hundred sixty thousand, six hundred fifteen".