22211122111221 has 32 divisors (see below), whose sum is σ = 29969545881600. Its totient is φ = 14630305536000.

The previous prime is 22211122111201. The next prime is 22211122111223. The reversal of 22211122111221 is 12211122111222.

It is not a de Polignac number, because 22211122111221 - 2¹⁷ = 22211121980149 is a prime.

It is a super-2 number, since 2×22211122111221² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22211122111223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3172560721 + ... + 3172567721.

It is an arithmetic number, because the mean of its divisors is an integer number (936548308800).

Almost surely, 2^{22211122111221} is an apocalyptic number.

It is an amenable number.

22211122111221 is a deficient number, since it is larger than the sum of its proper divisors (7758423770379).

22211122111221 is a wasteful number, since it uses less digits than its factorization.

22211122111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14109.

The product of its digits is 128, while the sum is 21.

Adding to 22211122111221 its reverse (12211122111222), we get a palindrome (34422244222443).

Subtracting from 22211122111221 its reverse (12211122111222), we obtain a palindrome (9999999999999).

The spelling of 22211122111221 in words is "twenty-two trillion, two hundred eleven billion, one hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".