21696627 has 4 divisors (see below), whose sum is σ = 28928840. Its totient is φ = 14464416.

The previous prime is 21696617. The next prime is 21696629. The reversal of 21696627 is 72669612.

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

It is not a de Polignac number, because 21696627 - 2²² = 17502323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21696629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3616102 + ... + 3616107.

It is an arithmetic number, because the mean of its divisors is an integer number (7232210).

Almost surely, 2^21696627 is an apocalyptic number.

21696627 is a deficient number, since it is larger than the sum of its proper divisors (7232213).

21696627 is an equidigital number, since it uses as much as digits as its factorization.

21696627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7232212.

The product of its digits is 54432, while the sum is 39.

The square root of 21696627 is about 4657.9638255358. The cubic root of 21696627 is about 278.9099926771.

The spelling of 21696627 in words is "twenty-one million, six hundred ninety-six thousand, six hundred twenty-seven".