21982825 has 12 divisors (see below), whose sum is σ = 28444608. Its totient is φ = 16821200.

The previous prime is 21982817. The next prime is 21982843. The reversal of 21982825 is 52828912.

It is not a de Polignac number, because 21982825 - 2³ = 21982817 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18541 + ... + 19690.

It is an arithmetic number, because the mean of its divisors is an integer number (2370384).

Almost surely, 2^21982825 is an apocalyptic number.

21982825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21982825 is a deficient number, since it is larger than the sum of its proper divisors (6461783).

21982825 is a wasteful number, since it uses less digits than its factorization.

21982825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38264 (or 38259 counting only the distinct ones).

The product of its digits is 23040, while the sum is 37.

The square root of 21982825 is about 4688.5845412022. The cubic root of 21982825 is about 280.1309973771.

The spelling of 21982825 in words is "twenty-one million, nine hundred eighty-two thousand, eight hundred twenty-five".