21444334 has 16 divisors (see below), whose sum is σ = 32820480. Its totient is φ = 10506240.

The previous prime is 21444323. The next prime is 21444341. The reversal of 21444334 is 43344412.

It is a junction number, because it is equal to n+sod(n) for n = 21444299 and 21444308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27502 + ... + 28270.

It is an arithmetic number, because the mean of its divisors is an integer number (2051280).

Almost surely, 2^21444334 is an apocalyptic number.

21444334 is a deficient number, since it is larger than the sum of its proper divisors (11376146).

21444334 is a wasteful number, since it uses less digits than its factorization.

21444334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035.

The product of its digits is 4608, while the sum is 25.

The square root of 21444334 is about 4630.8027381870. The cubic root of 21444334 is about 277.8247001386.

Adding to 21444334 its reverse (43344412), we get a palindrome (64788746).

The spelling of 21444334 in words is "twenty-one million, four hundred forty-four thousand, three hundred thirty-four".