21927159 has 16 divisors (see below), whose sum is σ = 34195200. Its totient is φ = 13848408.

The previous prime is 21927151. The next prime is 21927181. The reversal of 21927159 is 95172912.

It is not a de Polignac number, because 21927159 - 2³ = 21927151 is a prime.

It is a super-2 number, since 2×21927159² = 961600603622562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21927151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20859 + ... + 21884.

It is an arithmetic number, because the mean of its divisors is an integer number (2137200).

Almost surely, 2^21927159 is an apocalyptic number.

21927159 is a deficient number, since it is larger than the sum of its proper divisors (12268041).

21927159 is a wasteful number, since it uses less digits than its factorization.

21927159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42771 (or 42765 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 21927159 is about 4682.6444451827. The cubic root of 21927159 is about 279.8943436396.

The spelling of 21927159 in words is "twenty-one million, nine hundred twenty-seven thousand, one hundred fifty-nine".