21963328 has 14 divisors (see below), whose sum is σ = 43583606. Its totient is φ = 10981632.

The previous prime is 21963323. The next prime is 21963341. The reversal of 21963328 is 82336912.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13483584 + 8479744 = 3672^2 + 2912^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21963293 and 21963302.

It is not an unprimeable number, because it can be changed into a prime (21963323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171525 + ... + 171652.

Almost surely, 2^21963328 is an apocalyptic number.

It is an amenable number.

21963328 is a deficient number, since it is larger than the sum of its proper divisors (21620278).

21963328 is an equidigital number, since it uses as much as digits as its factorization.

21963328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343189 (or 343179 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 21963328 is about 4686.5048810387. The cubic root of 21963328 is about 280.0481549830.

The spelling of 21963328 in words is "twenty-one million, nine hundred sixty-three thousand, three hundred twenty-eight".