21826628 has 24 divisors (see below), whose sum is σ = 39465888. Its totient is φ = 10555776.

The previous prime is 21826621. The next prime is 21826643. The reversal of 21826628 is 82662812.

It is not an unprimeable number, because it can be changed into a prime (21826621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18875 + ... + 19997.

It is an arithmetic number, because the mean of its divisors is an integer number (1644412).

Almost surely, 2^21826628 is an apocalyptic number.

It is an amenable number.

21826628 is a deficient number, since it is larger than the sum of its proper divisors (17639260).

21826628 is a wasteful number, since it uses less digits than its factorization.

21826628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283 (or 1281 counting only the distinct ones).

The product of its digits is 18432, while the sum is 35.

The square root of 21826628 is about 4671.8976872359. The cubic root of 21826628 is about 279.4659377783.

The spelling of 21826628 in words is "twenty-one million, eight hundred twenty-six thousand, six hundred twenty-eight".