21337244 has 12 divisors (see below), whose sum is σ = 39536784. Its totient is φ = 10041024.

The previous prime is 21337241. The next prime is 21337273. The reversal of 21337244 is 44273312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21337241) 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, 156824 + ... + 156959.

It is an arithmetic number, because the mean of its divisors is an integer number (3294732).

Almost surely, 2^21337244 is an apocalyptic number.

It is an amenable number.

21337244 is a deficient number, since it is larger than the sum of its proper divisors (18199540).

21337244 is a wasteful number, since it uses less digits than its factorization.

21337244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313804 (or 313802 counting only the distinct ones).

The product of its digits is 4032, while the sum is 26.

The square root of 21337244 is about 4619.2254762027. The cubic root of 21337244 is about 277.3614556100.

The spelling of 21337244 in words is "twenty-one million, three hundred thirty-seven thousand, two hundred forty-four".