21996288 has 54 divisors (see below), whose sum is σ = 63427364. Its totient is φ = 7331328.

The previous prime is 21996277. The next prime is 21996323. The reversal of 21996288 is 88269912.

21996288 is a `hidden beast` number, since 2 + 19 + 9 + 628 + 8 = 666.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2470 + ... + 7077.

Almost surely, 2^21996288 is an apocalyptic number.

It is an amenable number.

21996288 is an abundant number, since it is smaller than the sum of its proper divisors (41431076).

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

21996288 is an equidigital number, since it uses as much as digits as its factorization.

21996288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9569 (or 9552 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 21996288 is about 4690.0200426011. The cubic root of 21996288 is about 280.1881728306.

The spelling of 21996288 in words is "twenty-one million, nine hundred ninety-six thousand, two hundred eighty-eight".