21444441 has 8 divisors (see below), whose sum is σ = 29835840. Its totient is φ = 13674672.

The previous prime is 21444433. The next prime is 21444457. The reversal of 21444441 is 14444412.

It is a happy number.

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

It is not a de Polignac number, because 21444441 - 2³ = 21444433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21444431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155326 + ... + 155463.

It is an arithmetic number, because the mean of its divisors is an integer number (3729480).

Almost surely, 2^21444441 is an apocalyptic number.

It is an amenable number.

21444441 is a deficient number, since it is larger than the sum of its proper divisors (8391399).

21444441 is a wasteful number, since it uses less digits than its factorization.

21444441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310815.

The product of its digits is 2048, while the sum is 24.

The square root of 21444441 is about 4630.8142912451. The cubic root of 21444441 is about 277.8251622217.

Adding to 21444441 its reverse (14444412), we get a palindrome (35888853).

It can be divided in two parts, 2 and 1444441, that multiplied together give a palindrome (2888882).

The spelling of 21444441 in words is "twenty-one million, four hundred forty-four thousand, four hundred forty-one".