21644114 has 8 divisors (see below), whose sum is σ = 32572848. Its totient is φ = 10786500.

The previous prime is 21644113. The next prime is 21644153. The reversal of 21644114 is 41144612.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21644114.

It is not an unprimeable number, because it can be changed into a prime (21644113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17012 + ... + 18239.

It is an arithmetic number, because the mean of its divisors is an integer number (4071606).

Almost surely, 2^21644114 is an apocalyptic number.

21644114 is a deficient number, since it is larger than the sum of its proper divisors (10928734).

21644114 is a wasteful number, since it uses less digits than its factorization.

21644114 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35560.

The product of its digits is 768, while the sum is 23.

The square root of 21644114 is about 4652.3235055185. The cubic root of 21644114 is about 278.6847928071.

Adding to 21644114 its reverse (41144612), we get a palindrome (62788726).

The spelling of 21644114 in words is "twenty-one million, six hundred forty-four thousand, one hundred fourteen".