21328352 has 12 divisors (see below), whose sum is σ = 41990256. Its totient is φ = 10664160.

The previous prime is 21328339. The next prime is 21328367. The reversal of 21328352 is 25382312.

It is a super-3 number, since 3×21328352³ (a number of 23 digits) contains 333 as substring.

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 as a sum of consecutive naturals, namely, 333224 + ... + 333287.

It is an arithmetic number, because the mean of its divisors is an integer number (3499188).

Almost surely, 2^21328352 is an apocalyptic number.

It is an amenable number.

21328352 is a deficient number, since it is larger than the sum of its proper divisors (20661904).

21328352 is an equidigital number, since it uses as much as digits as its factorization.

21328352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666521 (or 666513 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 21328352 is about 4618.2628768835. The cubic root of 21328352 is about 277.3229214122.

The spelling of 21328352 in words is "twenty-one million, three hundred twenty-eight thousand, three hundred fifty-two".