21896880 has 40 divisors (see below), whose sum is σ = 67881072. Its totient is φ = 5839104.

The previous prime is 21896879. The next prime is 21896893. The reversal of 21896880 is 8869812.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45379 + ... + 45858.

Almost surely, 2^21896880 is an apocalyptic number.

21896880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21896880 is an abundant number, since it is smaller than the sum of its proper divisors (45984192).

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

21896880 is a wasteful number, since it uses less digits than its factorization.

21896880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91253 (or 91247 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 21896880 is about 4679.4102192477. The cubic root of 21896880 is about 279.7654498356.

The spelling of 21896880 in words is "twenty-one million, eight hundred ninety-six thousand, eight hundred eighty".