21963825 has 48 divisors (see below), whose sum is σ = 43469440. Its totient is φ = 10808640.

The previous prime is 21963793. The next prime is 21963833. The reversal of 21963825 is 52836912.

21963825 is a `hidden beast` number, since 2 + 19 + 638 + 2 + 5 = 666.

It is not a de Polignac number, because 21963825 - 2⁵ = 21963793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21963825.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7524 + ... + 10026.

Almost surely, 2^21963825 is an apocalyptic number.

21963825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21963825 is a deficient number, since it is larger than the sum of its proper divisors (21505615).

21963825 is a wasteful number, since it uses less digits than its factorization.

21963825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2535 (or 2524 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 21963825 is about 4686.5579053288. The cubic root of 21963825 is about 280.0502673357.

The spelling of 21963825 in words is "twenty-one million, nine hundred sixty-three thousand, eight hundred twenty-five".