21344410111 has 4 divisors (see below), whose sum is σ = 21346049232. Its totient is φ = 21342770992.

The previous prime is 21344410091. The next prime is 21344410123. The reversal of 21344410111 is 11101444312.

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 21344410111 - 2⁵ = 21344410079 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 (21344410151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 799870 + ... + 826123.

It is an arithmetic number, because the mean of its divisors is an integer number (5336512308).

Almost surely, 2^21344410111 is an apocalyptic number.

21344410111 is a deficient number, since it is larger than the sum of its proper divisors (1639121).

21344410111 is a wasteful number, since it uses less digits than its factorization.

21344410111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639120.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 21344410111 its reverse (11101444312), we get a palindrome (32445854423).

The spelling of 21344410111 in words is "twenty-one billion, three hundred forty-four million, four hundred ten thousand, one hundred eleven".