21885441 has 8 divisors (see below), whose sum is σ = 29265600. Its totient is φ = 14547792.

The previous prime is 21885439. The next prime is 21885491. The reversal of 21885441 is 14458812.

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

It is not a de Polignac number, because 21885441 - 2¹ = 21885439 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21885491) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 9405 + ... + 11498.

It is an arithmetic number, because the mean of its divisors is an integer number (3658200).

Almost surely, 2^21885441 is an apocalyptic number.

It is an amenable number.

21885441 is a deficient number, since it is larger than the sum of its proper divisors (7380159).

21885441 is a wasteful number, since it uses less digits than its factorization.

21885441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21255.

The product of its digits is 10240, while the sum is 33.

The square root of 21885441 is about 4678.1877901598. The cubic root of 21885441 is about 279.7167245619.

The spelling of 21885441 in words is "twenty-one million, eight hundred eighty-five thousand, four hundred forty-one".