21179804 has 12 divisors (see below), whose sum is σ = 37108344. Its totient is φ = 10577424.

The previous prime is 21179791. The next prime is 21179819. The reversal of 21179804 is 40897112.

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, 1439 + ... + 6665.

It is an arithmetic number, because the mean of its divisors is an integer number (3092362).

Almost surely, 2^21179804 is an apocalyptic number.

It is an amenable number.

21179804 is a deficient number, since it is larger than the sum of its proper divisors (15928540).

21179804 is a wasteful number, since it uses less digits than its factorization.

21179804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6244 (or 6242 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 21179804 is about 4602.1521052655. The cubic root of 21179804 is about 276.6775867047.

The spelling of 21179804 in words is "twenty-one million, one hundred seventy-nine thousand, eight hundred four".