22111222212221 has 4 divisors (see below), whose sum is σ = 22112380675392. Its totient is φ = 22110063749052.

The previous prime is 22111222212187. The next prime is 22111222212223. The reversal of 22111222212221 is 12221222211122.

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-22111222212221 is a prime.

It is a super-2 number, since 2×22111222212221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22111222212223) 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 3 ways as a sum of consecutive naturals, for example, 579202955 + ... + 579241128.

It is an arithmetic number, because the mean of its divisors is an integer number (5528095168848).

Almost surely, 2^{22111222212221} is an apocalyptic number.

It is an amenable number.

22111222212221 is a deficient number, since it is larger than the sum of its proper divisors (1158463171).

22111222212221 is a wasteful number, since it uses less digits than its factorization.

22111222212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158463170.

The product of its digits is 512, while the sum is 23.

Adding to 22111222212221 its reverse (12221222211122), we get a palindrome (34332444423343).

The spelling of 22111222212221 in words is "twenty-two trillion, one hundred eleven billion, two hundred twenty-two million, two hundred twelve thousand, two hundred twenty-one".