21796808 has 16 divisors (see below), whose sum is σ = 44584560. Its totient is φ = 9907600.

The previous prime is 21796807. The next prime is 21796843. The reversal of 21796808 is 80869712.

It is not an unprimeable number, because it can be changed into a prime (21796807) 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, 123758 + ... + 123933.

It is an arithmetic number, because the mean of its divisors is an integer number (2786535).

Almost surely, 2^21796808 is an apocalyptic number.

It is an amenable number.

21796808 is an abundant number, since it is smaller than the sum of its proper divisors (22787752).

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

21796808 is a wasteful number, since it uses less digits than its factorization.

21796808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247708 (or 247704 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 21796808 is about 4668.7051738143. The cubic root of 21796808 is about 279.3386090194.

The spelling of 21796808 in words is "twenty-one million, seven hundred ninety-six thousand, eight hundred eight".