21959027 has 4 divisors (see below), whose sum is σ = 21971136. Its totient is φ = 21946920.

The previous prime is 21959017. The next prime is 21959029. The reversal of 21959027 is 72095912.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21959027 - 2¹⁰ = 21958003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21959029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2723 + ... + 7164.

It is an arithmetic number, because the mean of its divisors is an integer number (5492784).

Almost surely, 2^21959027 is an apocalyptic number.

21959027 is a deficient number, since it is larger than the sum of its proper divisors (12109).

21959027 is an equidigital number, since it uses as much as digits as its factorization.

21959027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12108.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 21959027 is about 4686.0459878238. The cubic root of 21959027 is about 280.0298735133.

The spelling of 21959027 in words is "twenty-one million, nine hundred fifty-nine thousand, twenty-seven".