21110928 has 20 divisors (see below), whose sum is σ = 54536688. Its totient is φ = 7036960.

The previous prime is 21110917. The next prime is 21110953. The reversal of 21110928 is 82901112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 21110898 and 21110907.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219858 + ... + 219953.

Almost surely, 2^21110928 is an apocalyptic number.

It is an amenable number.

21110928 is an abundant number, since it is smaller than the sum of its proper divisors (33425760).

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

21110928 is a wasteful number, since it uses less digits than its factorization.

21110928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439822 (or 439816 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 21110928 is about 4594.6629909059. The cubic root of 21110928 is about 276.3773456538.

The spelling of 21110928 in words is "twenty-one million, one hundred ten thousand, nine hundred twenty-eight".