21825822 has 8 divisors (see below), whose sum is σ = 43651656. Its totient is φ = 7275272.

The previous prime is 21825757. The next prime is 21825887. The reversal of 21825822 is 22852812.

It is an interprime number because it is at equal distance from previous prime (21825757) and next prime (21825887).

It is a sphenic number, since it is the product of 3 distinct primes.

21825822 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21825822.

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 3 ways as a sum of consecutive naturals, for example, 1818813 + ... + 1818824.

It is an arithmetic number, because the mean of its divisors is an integer number (5456457).

Almost surely, 2^21825822 is an apocalyptic number.

21825822 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21825822 is a wasteful number, since it uses less digits than its factorization.

21825822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3637642.

The product of its digits is 5120, while the sum is 30.

The square root of 21825822 is about 4671.8114259889. The cubic root of 21825822 is about 279.4624977552.

The spelling of 21825822 in words is "twenty-one million, eight hundred twenty-five thousand, eight hundred twenty-two".