21825948 has 24 divisors (see below), whose sum is σ = 51020928. Its totient is φ = 7261936.

The previous prime is 21825931. The next prime is 21825949. The reversal of 21825948 is 84952812.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21825949) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6865 + ... + 9527.

It is an arithmetic number, because the mean of its divisors is an integer number (2125872).

Almost surely, 2^21825948 is an apocalyptic number.

It is an amenable number.

21825948 is an abundant number, since it is smaller than the sum of its proper divisors (29194980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21825948 is a wasteful number, since it uses less digits than its factorization.

21825948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3353 (or 3351 counting only the distinct ones).

The product of its digits is 46080, while the sum is 39.

The square root of 21825948 is about 4671.8249111027. The cubic root of 21825948 is about 279.4630355311.

The spelling of 21825948 in words is "twenty-one million, eight hundred twenty-five thousand, nine hundred forty-eight".