21496808 has 16 divisors (see below), whose sum is σ = 40413060. Its totient is φ = 10720000.

The previous prime is 21496763. The next prime is 21496817. The reversal of 21496808 is 80869412.

It can be written as a sum of positive squares in 2 ways, for example, as 19695844 + 1800964 = 4438^2 + 1342^2 .

It is a super-2 number, since 2×21496808² = 924225508377728, which contains 22 as substring.

It is a congruent number.

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, 143 + ... + 6558.

Almost surely, 2^21496808 is an apocalyptic number.

It is an amenable number.

21496808 is a deficient number, since it is larger than the sum of its proper divisors (18916252).

21496808 is a wasteful number, since it uses less digits than its factorization.

21496808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7108 (or 7104 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 21496808 is about 4636.4650327593. The cubic root of 21496808 is about 278.0511266663.

The spelling of 21496808 in words is "twenty-one million, four hundred ninety-six thousand, eight hundred eight".