21344135 has 8 divisors (see below), whose sum is σ = 26047440. Its totient is φ = 16785664.

The previous prime is 21344131. The next prime is 21344159. The reversal of 21344135 is 53144312.

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 21344135 - 2² = 21344131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21344135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35882 + ... + 36471.

It is an arithmetic number, because the mean of its divisors is an integer number (3255930).

Almost surely, 2^21344135 is an apocalyptic number.

21344135 is a deficient number, since it is larger than the sum of its proper divisors (4703305).

21344135 is an equidigital number, since it uses as much as digits as its factorization.

21344135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72417.

The product of its digits is 1440, while the sum is 23.

The square root of 21344135 is about 4619.9713202573. The cubic root of 21344135 is about 277.3913109508.

Adding to 21344135 its reverse (53144312), we get a palindrome (74488447).

The spelling of 21344135 in words is "twenty-one million, three hundred forty-four thousand, one hundred thirty-five".