21175084 has 12 divisors (see below), whose sum is σ = 42350224. Its totient is φ = 9075024.

The previous prime is 21175079. The next prime is 21175087. The reversal of 21175084 is 48057112.

21175084 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 756253 = 21175084 / (2 + 1 + 1 + 7 + 5 + 0 + 8 + 4).

It is not an unprimeable number, because it can be changed into a prime (21175087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378099 + ... + 378154.

Almost surely, 2^21175084 is an apocalyptic number.

It is an amenable number.

21175084 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21175084 is a wasteful number, since it uses less digits than its factorization.

21175084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756264 (or 756262 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 21175084 is about 4601.6392731287. The cubic root of 21175084 is about 276.6570322930.

The spelling of 21175084 in words is "twenty-one million, one hundred seventy-five thousand, eighty-four".