21927656 has 8 divisors (see below), whose sum is σ = 41114370. Its totient is φ = 10963824.

The previous prime is 21927641. The next prime is 21927673. The reversal of 21927656 is 65672912.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18062500 + 3865156 = 4250^2 + 1966^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1370471 + ... + 1370486.

Almost surely, 2^21927656 is an apocalyptic number.

It is an amenable number.

21927656 is a deficient number, since it is larger than the sum of its proper divisors (19186714).

21927656 is a wasteful number, since it uses less digits than its factorization.

21927656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2740963 (or 2740959 counting only the distinct ones).

The product of its digits is 45360, while the sum is 38.

The square root of 21927656 is about 4682.6975131862. The cubic root of 21927656 is about 279.8964583145.

The spelling of 21927656 in words is "twenty-one million, nine hundred twenty-seven thousand, six hundred fifty-six".