22221112111221 has 8 divisors (see below), whose sum is σ = 29628214121664. Its totient is φ = 14814042420800.

The previous prime is 22221112111217. The next prime is 22221112111241. The reversal of 22221112111221 is 12211121112222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22221112111221 - 2² = 22221112111217 is a prime.

It is a super-2 number, since 2×22221112111221² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221112111241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6427476 + ... + 9260381.

It is an arithmetic number, because the mean of its divisors is an integer number (3703526765208).

Almost surely, 2^{22221112111221} is an apocalyptic number.

It is an amenable number.

22221112111221 is a deficient number, since it is larger than the sum of its proper divisors (7407102010443).

22221112111221 is a wasteful number, since it uses less digits than its factorization.

22221112111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16160011.

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

Adding to 22221112111221 its reverse (12211121112222), we get a palindrome (34432233223443).

The spelling of 22221112111221 in words is "twenty-two trillion, two hundred twenty-one billion, one hundred twelve million, one hundred eleven thousand, two hundred twenty-one".