21946027 has 4 divisors (see below), whose sum is σ = 21957696. Its totient is φ = 21934360.

The previous prime is 21946019. The next prime is 21946033. The reversal of 21946027 is 72064912.

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 21946027 - 2³ = 21946019 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21946027.

It is not an unprimeable number, because it can be changed into a prime (21946087) 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, 2299 + ... + 7012.

It is an arithmetic number, because the mean of its divisors is an integer number (5489424).

Almost surely, 2^21946027 is an apocalyptic number.

21946027 is a deficient number, since it is larger than the sum of its proper divisors (11669).

21946027 is an equidigital number, since it uses as much as digits as its factorization.

21946027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11668.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 21946027 is about 4684.6586855394. The cubic root of 21946027 is about 279.9746022882.

The spelling of 21946027 in words is "twenty-one million, nine hundred forty-six thousand, twenty-seven".