22222222122221 has 16 divisors (see below), whose sum is σ = 24829569930240. Its totient is φ = 19715209362480.

The previous prime is 22222222122173. The next prime is 22222222122223. The reversal of 22222222122221 is 12222122222222.

It is a cyclic number.

It is not a de Polignac number, because 22222222122221 - 2³⁰ = 22221148380397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22222222122223) 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, 61755791 + ... + 62114588.

It is an arithmetic number, because the mean of its divisors is an integer number (1551848120640).

Almost surely, 2^{22222222122221} is an apocalyptic number.

It is an amenable number.

22222222122221 is a deficient number, since it is larger than the sum of its proper divisors (2607347808019).

22222222122221 is a wasteful number, since it uses less digits than its factorization.

22222222122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123870784.

The product of its digits is 4096, while the sum is 26.

Adding to 22222222122221 its reverse (12222122222222), we get a palindrome (34444344344443).

The spelling of 22222222122221 in words is "twenty-two trillion, two hundred twenty-two billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred twenty-one".