21344383 has 4 divisors (see below), whose sum is σ = 21840808. Its totient is φ = 20847960.

The previous prime is 21344369. The next prime is 21344417. The reversal of 21344383 is 38344312.

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 21344383 - 2¹³ = 21336191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248148 + ... + 248233.

It is an arithmetic number, because the mean of its divisors is an integer number (5460202).

Almost surely, 2^21344383 is an apocalyptic number.

21344383 is a deficient number, since it is larger than the sum of its proper divisors (496425).

21344383 is an equidigital number, since it uses as much as digits as its factorization.

21344383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496424.

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

The square root of 21344383 is about 4619.9981601728. The cubic root of 21344383 is about 277.3923852939.

Adding to 21344383 its reverse (38344312), we get a palindrome (59688695).

The spelling of 21344383 in words is "twenty-one million, three hundred forty-four thousand, three hundred eighty-three".