22110111221 has 4 divisors (see below), whose sum is σ = 24120121344. Its totient is φ = 20100101100.

The previous prime is 22110111161. The next prime is 22110111223. The reversal of 22110111221 is 12211101122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22110111221 - 2²⁶ = 22043002357 is a prime.

It is a super-2 number, since 2×22110111221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22110111196 and 22110111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22110111223) 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, 1005005045 + ... + 1005005066.

It is an arithmetic number, because the mean of its divisors is an integer number (6030030336).

Almost surely, 2^22110111221 is an apocalyptic number.

It is an amenable number.

22110111221 is a deficient number, since it is larger than the sum of its proper divisors (2010010123).

22110111221 is a wasteful number, since it uses less digits than its factorization.

22110111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010010122.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 22110111221 its reverse (12211101122), we get a palindrome (34321212343).

It can be divided in two parts, 22110 and 111221, that added together give a palindrome (133331).

The spelling of 22110111221 in words is "twenty-two billion, one hundred ten million, one hundred eleven thousand, two hundred twenty-one".