21214441211 has 4 divisors (see below), whose sum is σ = 21219869424. Its totient is φ = 21209013000.

The previous prime is 21214441201. The next prime is 21214441229. The reversal of 21214441211 is 11214441212.

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 21214441211 - 2²² = 21210246907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21214441201) 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, 2708240 + ... + 2716061.

It is an arithmetic number, because the mean of its divisors is an integer number (5304967356).

Almost surely, 2^21214441211 is an apocalyptic number.

21214441211 is a deficient number, since it is larger than the sum of its proper divisors (5428213).

21214441211 is an equidigital number, since it uses as much as digits as its factorization.

21214441211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5428212.

The product of its digits is 512, while the sum is 23.

Adding to 21214441211 its reverse (11214441212), we get a palindrome (32428882423).

Subtracting from 21214441211 its reverse (11214441212), we obtain a palindrome (9999999999).

The spelling of 21214441211 in words is "twenty-one billion, two hundred fourteen million, four hundred forty-one thousand, two hundred eleven".