22112121222221 has 16 divisors (see below), whose sum is σ = 22214092523520. Its totient is φ = 22010409521280.

The previous prime is 22112121222203. The next prime is 22112121222277. The reversal of 22112121222221 is 12222212121122.

It is a cyclic number.

It is not a de Polignac number, because 22112121222221 - 2¹⁸ = 22112120960077 is a prime.

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 (22112120222221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 801643796 + ... + 801671378.

It is an arithmetic number, because the mean of its divisors is an integer number (1388380782720).

Almost surely, 2^{22112121222221} is an apocalyptic number.

It is an amenable number.

22112121222221 is a deficient number, since it is larger than the sum of its proper divisors (101971301299).

22112121222221 is a wasteful number, since it uses less digits than its factorization.

22112121222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32156.

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

Adding to 22112121222221 its reverse (12222212121122), we get a palindrome (34334333343343).

The spelling of 22112121222221 in words is "twenty-two trillion, one hundred twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".