21928630 has 8 divisors (see below), whose sum is σ = 39471552. Its totient is φ = 8771448.

The previous prime is 21928619. The next prime is 21928639. The reversal of 21928630 is 3682912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21928592 and 21928601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21928639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1096422 + ... + 1096441.

It is an arithmetic number, because the mean of its divisors is an integer number (4933944).

Almost surely, 2^21928630 is an apocalyptic number.

21928630 is a deficient number, since it is larger than the sum of its proper divisors (17542922).

21928630 is a wasteful number, since it uses less digits than its factorization.

21928630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2192870.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 21928630 is about 4682.8015119157. The cubic root of 21928630 is about 279.9006024740.

The spelling of 21928630 in words is "twenty-one million, nine hundred twenty-eight thousand, six hundred thirty".