21441656 has 16 divisors (see below), whose sum is σ = 40619040. Its totient is φ = 10609920.

The previous prime is 21441617. The next prime is 21441661. The reversal of 21441656 is 65614412.

It is a super-2 number, since 2×21441656² = 919489224044672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13040 + ... + 14591.

It is an arithmetic number, because the mean of its divisors is an integer number (2538690).

Almost surely, 2^21441656 is an apocalyptic number.

It is an amenable number.

21441656 is a deficient number, since it is larger than the sum of its proper divisors (19177384).

21441656 is a wasteful number, since it uses less digits than its factorization.

21441656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27734 (or 27730 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 21441656 is about 4630.5135784273. The cubic root of 21441656 is about 277.8131346046.

The spelling of 21441656 in words is "twenty-one million, four hundred forty-one thousand, six hundred fifty-six".