21344442 has 32 divisors (see below), whose sum is σ = 48926592. Its totient is φ = 6081024.

The previous prime is 21344419. The next prime is 21344447. The reversal of 21344442 is 24444312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21344447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24478 + ... + 25334.

It is an arithmetic number, because the mean of its divisors is an integer number (1528956).

Almost surely, 2^21344442 is an apocalyptic number.

21344442 is an abundant number, since it is smaller than the sum of its proper divisors (27582150).

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

21344442 is a wasteful number, since it uses less digits than its factorization.

21344442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462.

The product of its digits is 3072, while the sum is 24.

The square root of 21344442 is about 4620.0045454523. The cubic root of 21344442 is about 277.3926408824.

Adding to 21344442 its reverse (24444312), we get a palindrome (45788754).

The spelling of 21344442 in words is "twenty-one million, three hundred forty-four thousand, four hundred forty-two".