21848656 has 20 divisors (see below), whose sum is σ = 42429204. Its totient is φ = 10899200.

The previous prime is 21848653. The next prime is 21848657. The reversal of 21848656 is 65684812.

It can be written as a sum of positive squares in 2 ways, for example, as 12362256 + 9486400 = 3516^2 + 3080^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21848653) 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, 7026 + ... + 9646.

Almost surely, 2^21848656 is an apocalyptic number.

It is an amenable number.

21848656 is a deficient number, since it is larger than the sum of its proper divisors (20580548).

21848656 is a wasteful number, since it uses less digits than its factorization.

21848656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3150 (or 3144 counting only the distinct ones).

The product of its digits is 92160, while the sum is 40.

The square root of 21848656 is about 4674.2545929806. The cubic root of 21848656 is about 279.5599209302.

The spelling of 21848656 in words is "twenty-one million, eight hundred forty-eight thousand, six hundred fifty-six".