21196808 has 32 divisors (see below), whose sum is σ = 41410560. Its totient is φ = 10160640.

The previous prime is 21196793. The next prime is 21196811. The reversal of 21196808 is 80869112.

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, 31160 + ... + 31832.

It is an arithmetic number, because the mean of its divisors is an integer number (1294080).

Almost surely, 2^21196808 is an apocalyptic number.

It is an amenable number.

21196808 is a deficient number, since it is larger than the sum of its proper divisors (20213752).

21196808 is a wasteful number, since it uses less digits than its factorization.

21196808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837 (or 833 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 21196808 is about 4603.9991311902. Note that the first 3 decimals coincide. The cubic root of 21196808 is about 276.7516095367.

The spelling of 21196808 in words is "twenty-one million, one hundred ninety-six thousand, eight hundred eight".