21344255 has 8 divisors (see below), whose sum is σ = 25815552. Its totient is φ = 16940448.

The previous prime is 21344249. The next prime is 21344273. The reversal of 21344255 is 55244312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21344255 - 2¹⁸ = 21082111 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16172 + ... + 17441.

It is an arithmetic number, because the mean of its divisors is an integer number (3226944).

Almost surely, 2^21344255 is an apocalyptic number.

21344255 is a deficient number, since it is larger than the sum of its proper divisors (4471297).

21344255 is a wasteful number, since it uses less digits than its factorization.

21344255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33745.

The product of its digits is 4800, while the sum is 26.

The square root of 21344255 is about 4619.9843073327. The cubic root of 21344255 is about 277.3918307953.

Adding to 21344255 its reverse (55244312), we get a palindrome (76588567).

The spelling of 21344255 in words is "twenty-one million, three hundred forty-four thousand, two hundred fifty-five".