21650828 has 12 divisors (see below), whose sum is σ = 37928352. Its totient is φ = 10814160.

The previous prime is 21650813. The next prime is 21650831. The reversal of 21650828 is 82805612.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21650794 and 21650803.

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, 2726 + ... + 7122.

It is an arithmetic number, because the mean of its divisors is an integer number (3160696).

Almost surely, 2^21650828 is an apocalyptic number.

It is an amenable number.

21650828 is a deficient number, since it is larger than the sum of its proper divisors (16277524).

21650828 is a wasteful number, since it uses less digits than its factorization.

21650828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5632 (or 5630 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 21650828 is about 4653.0450244974. The cubic root of 21650828 is about 278.7136058178.

The spelling of 21650828 in words is "twenty-one million, six hundred fifty thousand, eight hundred twenty-eight".