21199404 has 12 divisors (see below), whose sum is σ = 49465304. Its totient is φ = 7066464.

The previous prime is 21199369. The next prime is 21199411. The reversal of 21199404 is 40499112.

It is a tau number, because it is divible by the number of its divisors (12).

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, 883297 + ... + 883320.

Almost surely, 2^21199404 is an apocalyptic number.

It is an amenable number.

21199404 is an abundant number, since it is smaller than the sum of its proper divisors (28265900).

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

21199404 is a wasteful number, since it uses less digits than its factorization.

21199404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766624 (or 1766622 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 21199404 is about 4604.2810513695. The cubic root of 21199404 is about 276.7629071159.

The spelling of 21199404 in words is "twenty-one million, one hundred ninety-nine thousand, four hundred four".