21327744 has 32 divisors (see below), whose sum is σ = 56652840. Its totient is φ = 7109120.

The previous prime is 21327727. The next prime is 21327751. The reversal of 21327744 is 44772312.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

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, 27387 + ... + 28154.

Almost surely, 2^21327744 is an apocalyptic number.

21327744 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21327744 is an abundant number, since it is smaller than the sum of its proper divisors (35325096).

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

21327744 is an equidigital number, since it uses as much as digits as its factorization.

21327744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55558 (or 55546 counting only the distinct ones).

The product of its digits is 9408, while the sum is 30.

The square root of 21327744 is about 4618.1970507981. The cubic root of 21327744 is about 277.3202862041.

The spelling of 21327744 in words is "twenty-one million, three hundred twenty-seven thousand, seven hundred forty-four".