21344328 has 48 divisors (see below), whose sum is σ = 58020300. Its totient is φ = 7088640.

The previous prime is 21344311. The next prime is 21344339. The reversal of 21344328 is 82344312.

21344328 is a `hidden beast` number, since 213 + 443 + 2 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19554084 + 1790244 = 4422^2 + 1338^2 .

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37228 + ... + 37796.

Almost surely, 2^21344328 is an apocalyptic number.

It is an amenable number.

21344328 is an abundant number, since it is smaller than the sum of its proper divisors (36675972).

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

21344328 is a wasteful number, since it uses less digits than its factorization.

21344328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102 (or 1095 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 21344328 is about 4619.9922077856. The cubic root of 21344328 is about 277.3921470331.

The spelling of 21344328 in words is "twenty-one million, three hundred forty-four thousand, three hundred twenty-eight".