21074184 has 48 divisors (see below), whose sum is σ = 59049900. Its totient is φ = 6781824.

The previous prime is 21074153. The next prime is 21074197. The reversal of 21074184 is 48147012.

It can be written as a sum of positive squares in 2 ways, for example, as 21068100 + 6084 = 4590^2 + 78^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2959 + ... + 7134.

Almost surely, 2^21074184 is an apocalyptic number.

21074184 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21074184 is an abundant number, since it is smaller than the sum of its proper divisors (37975716).

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

21074184 is a wasteful number, since it uses less digits than its factorization.

21074184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10134 (or 10127 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 21074184 is about 4590.6626972584. The cubic root of 21074184 is about 276.2169057357.

The spelling of 21074184 in words is "twenty-one million, seventy-four thousand, one hundred eighty-four".