21344212211 has 8 divisors (see below), whose sum is σ = 24529662720. Its totient is φ = 18192831048.

The previous prime is 21344212199. The next prime is 21344212217. The reversal of 21344212211 is 11221244312.

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

It is a de Polignac number, because none of the positive numbers 2^k-21344212211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21344212217) 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, 8515991 + ... + 8518496.

It is an arithmetic number, because the mean of its divisors is an integer number (3066207840).

Almost surely, 2^21344212211 is an apocalyptic number.

21344212211 is a deficient number, since it is larger than the sum of its proper divisors (3185450509).

21344212211 is a wasteful number, since it uses less digits than its factorization.

21344212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17034673.

The product of its digits is 768, while the sum is 23.

Adding to 21344212211 its reverse (11221244312), we get a palindrome (32565456523).

The spelling of 21344212211 in words is "twenty-one billion, three hundred forty-four million, two hundred twelve thousand, two hundred eleven".