21344111 has 4 divisors (see below), whose sum is σ = 21353352. Its totient is φ = 21334872.

The previous prime is 21344093. The next prime is 21344117. The reversal of 21344111 is 11144312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21344111 - 2¹⁴ = 21327727 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21344111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344117) 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, 2285 + ... + 6921.

It is an arithmetic number, because the mean of its divisors is an integer number (5338338).

Almost surely, 2^21344111 is an apocalyptic number.

21344111 is a deficient number, since it is larger than the sum of its proper divisors (9241).

21344111 is an equidigital number, since it uses as much as digits as its factorization.

21344111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9240.

The product of its digits is 96, while the sum is 17.

The square root of 21344111 is about 4619.9687228379. The cubic root of 21344111 is about 277.3912069816.

Adding to 21344111 its reverse (11144312), we get a palindrome (32488423).

The spelling of 21344111 in words is "twenty-one million, three hundred forty-four thousand, one hundred eleven".