21885056 has 32 divisors (see below), whose sum is σ = 44787180. Its totient is φ = 10644480.

The previous prime is 21885041. The next prime is 21885067. The reversal of 21885056 is 65058812.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21307456 + 577600 = 4616^2 + 760^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×21885056² = 957911352246272, which contains 22 as substring.

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, 2426 + ... + 7046.

Almost surely, 2^21885056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21885056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22393590).

21885056 is an abundant number, since it is smaller than the sum of its proper divisors (22902124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21885056 is an equidigital number, since it uses as much as digits as its factorization.

21885056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4672 (or 4660 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 21885056 is about 4678.1466415665. The cubic root of 21885056 is about 279.7150843304.

The spelling of 21885056 in words is "twenty-one million, eight hundred eighty-five thousand, fifty-six".