21338344 has 16 divisors (see below), whose sum is σ = 41091300. Its totient is φ = 10380672.

The previous prime is 21338333. The next prime is 21338347. The reversal of 21338344 is 44383312.

It can be written as a sum of positive squares in 2 ways, for example, as 18576100 + 2762244 = 4310^2 + 1662^2 .

It is not an unprimeable number, because it can be changed into a prime (21338347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35749 + ... + 36340.

Almost surely, 2^21338344 is an apocalyptic number.

It is an amenable number.

21338344 is a deficient number, since it is larger than the sum of its proper divisors (19752956).

21338344 is a wasteful number, since it uses less digits than its factorization.

21338344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72132 (or 72128 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

The square root of 21338344 is about 4619.3445422484. The cubic root of 21338344 is about 277.3662218044.

The spelling of 21338344 in words is "twenty-one million, three hundred thirty-eight thousand, three hundred forty-four".