21825748 has 24 divisors (see below), whose sum is σ = 45158400. Its totient is φ = 9031008.

The previous prime is 21825743. The next prime is 21825751. The reversal of 21825748 is 84752812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21825743) 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, 12628 + ... + 14251.

It is an arithmetic number, because the mean of its divisors is an integer number (1881600).

Almost surely, 2^21825748 is an apocalyptic number.

21825748 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21825748 is an abundant number, since it is smaller than the sum of its proper divisors (23332652).

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

21825748 is a wasteful number, since it uses less digits than its factorization.

21825748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26919 (or 26917 counting only the distinct ones).

The product of its digits is 35840, while the sum is 37.

The square root of 21825748 is about 4671.8035061419. The cubic root of 21825748 is about 279.4621819175.

The spelling of 21825748 in words is "twenty-one million, eight hundred twenty-five thousand, seven hundred forty-eight".