21452656 has 20 divisors (see below), whose sum is σ = 42136192. Its totient is φ = 10578816.

The previous prime is 21452611. The next prime is 21452659. The reversal of 21452656 is 65625412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21452659) 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, 8016 + ... + 10351.

Almost surely, 2^21452656 is an apocalyptic number.

It is an amenable number.

21452656 is a deficient number, since it is larger than the sum of its proper divisors (20683536).

21452656 is a wasteful number, since it uses less digits than its factorization.

21452656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18448 (or 18442 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

The square root of 21452656 is about 4631.7011993435. The cubic root of 21452656 is about 277.8606343879.

The spelling of 21452656 in words is "twenty-one million, four hundred fifty-two thousand, six hundred fifty-six".