22100111221 has 4 divisors (see below), whose sum is σ = 22150453600. Its totient is φ = 22049768844.

The previous prime is 22100111207. The next prime is 22100111227. The reversal of 22100111221 is 12211100122.

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 a de Polignac number, because none of the positive numbers 2^k-22100111221 is a prime.

It is a super-2 number, since 2×22100111221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22100111227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25170531 + ... + 25171408.

It is an arithmetic number, because the mean of its divisors is an integer number (5537613400).

Almost surely, 2^22100111221 is an apocalyptic number.

It is an amenable number.

22100111221 is a deficient number, since it is larger than the sum of its proper divisors (50342379).

22100111221 is an equidigital number, since it uses as much as digits as its factorization.

22100111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50342378.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 22100111221 its reverse (12211100122), we get a palindrome (34311211343).

The spelling of 22100111221 in words is "twenty-two billion, one hundred million, one hundred eleven thousand, two hundred twenty-one".