21344411 has 4 divisors (see below), whose sum is σ = 23284824. Its totient is φ = 19404000.

The previous prime is 21344369. The next prime is 21344417. The reversal of 21344411 is 11444312.

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

It is not a de Polignac number, because 21344411 - 2⁶ = 21344347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21344417) 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, 970190 + ... + 970211.

It is an arithmetic number, because the mean of its divisors is an integer number (5821206).

Almost surely, 2^21344411 is an apocalyptic number.

21344411 is a deficient number, since it is larger than the sum of its proper divisors (1940413).

21344411 is a wasteful number, since it uses less digits than its factorization.

21344411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940412.

The product of its digits is 384, while the sum is 20.

The square root of 21344411 is about 4620.0011904760. The cubic root of 21344411 is about 277.3925065902.

Adding to 21344411 its reverse (11444312), we get a palindrome (32788723).

Subtracting from 21344411 its reverse (11444312), we obtain a palindrome (9900099).

The spelling of 21344411 in words is "twenty-one million, three hundred forty-four thousand, four hundred eleven".