21825414 has 48 divisors (see below), whose sum is σ = 53617200. Its totient is φ = 6360768.

The previous prime is 21825403. The next prime is 21825439. The reversal of 21825414 is 41452812.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 1992 + ... + 6900.

It is an arithmetic number, because the mean of its divisors is an integer number (1117025).

Almost surely, 2^21825414 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21825414, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26808600).

21825414 is an abundant number, since it is smaller than the sum of its proper divisors (31791786).

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

21825414 is a wasteful number, since it uses less digits than its factorization.

21825414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4949 (or 4946 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 21825414 is about 4671.7677596387. The cubic root of 21825414 is about 279.4607563712.

The spelling of 21825414 in words is "twenty-one million, eight hundred twenty-five thousand, four hundred fourteen".