21344683 has 4 divisors (see below), whose sum is σ = 21533688. Its totient is φ = 21155680.

The previous prime is 21344677. The next prime is 21344699. The reversal of 21344683 is 38644312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21344683 - 2¹⁷ = 21213611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21344623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94333 + ... + 94558.

It is an arithmetic number, because the mean of its divisors is an integer number (5383422).

Almost surely, 2^21344683 is an apocalyptic number.

21344683 is a deficient number, since it is larger than the sum of its proper divisors (189005).

21344683 is a wasteful number, since it uses less digits than its factorization.

21344683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189004.

The product of its digits is 13824, while the sum is 31.

The square root of 21344683 is about 4620.0306276041. The cubic root of 21344683 is about 277.3936848915.

Adding to 21344683 its reverse (38644312), we get a palindrome (59988995).

The spelling of 21344683 in words is "twenty-one million, three hundred forty-four thousand, six hundred eighty-three".