21944082 has 8 divisors (see below), whose sum is σ = 43888176. Its totient is φ = 7314692.

The previous prime is 21944081. The next prime is 21944089. The reversal of 21944082 is 28044912.

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

21944082 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21944081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1828668 + ... + 1828679.

It is an arithmetic number, because the mean of its divisors is an integer number (5486022).

Almost surely, 2^21944082 is an apocalyptic number.

21944082 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.

21944082 is a wasteful number, since it uses less digits than its factorization.

21944082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3657352.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 21944082 is about 4684.4510884414. The cubic root of 21944082 is about 279.9663309856.

Adding to 21944082 its reverse (28044912), we get a palindrome (49988994).

The spelling of 21944082 in words is "twenty-one million, nine hundred forty-four thousand, eighty-two".