21825426 has 32 divisors (see below), whose sum is σ = 51499008. Its totient is φ = 6034320.

The previous prime is 21825403. The next prime is 21825439. The reversal of 21825426 is 62452812.

It is a junction number, because it is equal to n+sod(n) for n = 21825393 and 21825402.

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 15 ways as a sum of consecutive naturals, for example, 7080 + ... + 9683.

It is an arithmetic number, because the mean of its divisors is an integer number (1609344).

Almost surely, 2^21825426 is an apocalyptic number.

21825426 is an abundant number, since it is smaller than the sum of its proper divisors (29673582).

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

21825426 is a wasteful number, since it uses less digits than its factorization.

21825426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16806.

The product of its digits is 7680, while the sum is 30.

The square root of 21825426 is about 4671.7690439490. The cubic root of 21825426 is about 279.4608075887.

The spelling of 21825426 in words is "twenty-one million, eight hundred twenty-five thousand, four hundred twenty-six".