21222241111 has 4 divisors (see below), whose sum is σ = 21222622800. Its totient is φ = 21221859424.

The previous prime is 21222241097. The next prime is 21222241129. The reversal of 21222241111 is 11114222212.

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 21222241111 - 2²⁵ = 21188686679 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 (21222241141) 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, 89506 + ... + 224623.

It is an arithmetic number, because the mean of its divisors is an integer number (5305655700).

Almost surely, 2^21222241111 is an apocalyptic number.

21222241111 is a deficient number, since it is larger than the sum of its proper divisors (381689).

21222241111 is an equidigital number, since it uses as much as digits as its factorization.

21222241111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381688.

The product of its digits is 128, while the sum is 19.

Adding to 21222241111 its reverse (11114222212), we get a palindrome (32336463323).

The spelling of 21222241111 in words is "twenty-one billion, two hundred twenty-two million, two hundred forty-one thousand, one hundred eleven".