21607028 has 48 divisors (see below), whose sum is σ = 42577920. Its totient is φ = 9545184.

The previous prime is 21607013. The next prime is 21607063. The reversal of 21607028 is 82070612.

It is a junction number, because it is equal to n+sod(n) for n = 21606988 and 21607006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82025 + ... + 82287.

It is an arithmetic number, because the mean of its divisors is an integer number (887040).

Almost surely, 2^21607028 is an apocalyptic number.

It is an amenable number.

21607028 is a deficient number, since it is larger than the sum of its proper divisors (20970892).

21607028 is a wasteful number, since it uses less digits than its factorization.

21607028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 21607028 is about 4648.3360463719. The cubic root of 21607028 is about 278.5255314510.

The spelling of 21607028 in words is "twenty-one million, six hundred seven thousand, twenty-eight".