21444344 has 16 divisors (see below), whose sum is σ = 42573600. Its totient is φ = 10091392.

The previous prime is 21444341. The next prime is 21444347. The reversal of 21444344 is 44344412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21444341) and next prime (21444347).

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444341) 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, 78704 + ... + 78975.

It is an arithmetic number, because the mean of its divisors is an integer number (2660850).

Almost surely, 2^21444344 is an apocalyptic number.

It is an amenable number.

21444344 is a deficient number, since it is larger than the sum of its proper divisors (21129256).

21444344 is a wasteful number, since it uses less digits than its factorization.

21444344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157702 (or 157698 counting only the distinct ones).

The product of its digits is 6144, while the sum is 26.

The square root of 21444344 is about 4630.8038179133. The cubic root of 21444344 is about 277.8247433240.

Adding to 21444344 its reverse (44344412), we get a palindrome (65788756).

The spelling of 21444344 in words is "twenty-one million, four hundred forty-four thousand, three hundred forty-four".