21600928 has 12 divisors (see below), whose sum is σ = 42526890. Its totient is φ = 10800448.

The previous prime is 21600907. The next prime is 21600937. The reversal of 21600928 is 82900612.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19607184 + 1993744 = 4428^2 + 1412^2 .

It is a super-2 number, since 2×21600928² = 933200180922368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21600896 and 21600905.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 337483 + ... + 337546.

Almost surely, 2^21600928 is an apocalyptic number.

It is an amenable number.

21600928 is a deficient number, since it is larger than the sum of its proper divisors (20925962).

21600928 is an equidigital number, since it uses as much as digits as its factorization.

21600928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675039 (or 675031 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 21600928 is about 4647.6798512806. The cubic root of 21600928 is about 278.4993182878.

The spelling of 21600928 in words is "twenty-one million, six hundred thousand, nine hundred twenty-eight".