21179404 has 12 divisors (see below), whose sum is σ = 37183104. Its totient is φ = 10555664.

The previous prime is 21179401. The next prime is 21179413. The reversal of 21179404 is 40497112.

It is not an unprimeable number, because it can be changed into a prime (21179401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7084 + ... + 9619.

It is an arithmetic number, because the mean of its divisors is an integer number (3098592).

Almost surely, 2^21179404 is an apocalyptic number.

It is an amenable number.

21179404 is a deficient number, since it is larger than the sum of its proper divisors (16003700).

21179404 is a wasteful number, since it uses less digits than its factorization.

21179404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17024 (or 17022 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 21179404 is about 4602.1086471312. The cubic root of 21179404 is about 276.6758449238.

The spelling of 21179404 in words is "twenty-one million, one hundred seventy-nine thousand, four hundred four".