21344424211 has 8 divisors (see below), whose sum is σ = 23291108784. Its totient is φ = 19398786720.

The previous prime is 21344424163. The next prime is 21344424217. The reversal of 21344424211 is 11242444312.

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 21344424211 - 2¹⁵ = 21344391443 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 21344424211.

It is not an unprimeable number, because it can be changed into a prime (21344424217) 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, 218836 + ... + 300961.

It is an arithmetic number, because the mean of its divisors is an integer number (2911388598).

Almost surely, 2^21344424211 is an apocalyptic number.

21344424211 is a deficient number, since it is larger than the sum of its proper divisors (1946684573).

21344424211 is a wasteful number, since it uses less digits than its factorization.

21344424211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523541.

The product of its digits is 6144, while the sum is 28.

Adding to 21344424211 its reverse (11242444312), we get a palindrome (32586868523).

The spelling of 21344424211 in words is "twenty-one billion, three hundred forty-four million, four hundred twenty-four thousand, two hundred eleven".