21444522 has 32 divisors (see below), whose sum is σ = 47265984. Its totient is φ = 6432000.

The previous prime is 21444499. The next prime is 21444541. The reversal of 21444522 is 22544412.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21444492 and 21444501.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5058 + ... + 8274.

It is an arithmetic number, because the mean of its divisors is an integer number (1477062).

Almost surely, 2^21444522 is an apocalyptic number.

21444522 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21444522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23632992).

21444522 is an abundant number, since it is smaller than the sum of its proper divisors (25821462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21444522 is a wasteful number, since it uses less digits than its factorization.

21444522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3334.

The product of its digits is 2560, while the sum is 24.

The square root of 21444522 is about 4630.8230369989. The cubic root of 21444522 is about 277.8255120219.

Adding to 21444522 its reverse (22544412), we get a palindrome (43988934).

It can be divided in two parts, 2144 and 4522, that added together give a palindrome (6666).

The spelling of 21444522 in words is "twenty-one million, four hundred forty-four thousand, five hundred twenty-two".