21412808 has 16 divisors (see below), whose sum is σ = 40548060. Its totient is φ = 10600000.

The previous prime is 21412801. The next prime is 21412823. The reversal of 21412808 is 80821412.

It can be written as a sum of positive squares in 2 ways, for example, as 20448484 + 964324 = 4522^2 + 982^2 .

It is not an unprimeable number, because it can be changed into a prime (21412801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12443 + ... + 14058.

Almost surely, 2^21412808 is an apocalyptic number.

It is an amenable number.

21412808 is a deficient number, since it is larger than the sum of its proper divisors (19135252).

21412808 is a wasteful number, since it uses less digits than its factorization.

21412808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26608 (or 26604 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 21412808 is about 4627.3975407350. The cubic root of 21412808 is about 277.6884870461.

The spelling of 21412808 in words is "twenty-one million, four hundred twelve thousand, eight hundred eight".