2222122212221 has 4 divisors (see below), whose sum is σ = 2318736221472. Its totient is φ = 2125508202972.

The previous prime is 2222122212203. The next prime is 2222122212223. The reversal of 2222122212221 is 1222122212222.

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 not a de Polignac number, because 2222122212221 - 2⁶ = 2222122212157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 96614009227 = 2222122212221 / (2 + 2 + 2 + 2 + 1 + 2 + 2 + 2 + 1 + 2 + 2 + 2 + 1).

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 (2222122212223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48307004591 + ... + 48307004636.

It is an arithmetic number, because the mean of its divisors is an integer number (579684055368).

Almost surely, 2^{2222122212221} is an apocalyptic number.

It is an amenable number.

2222122212221 is a deficient number, since it is larger than the sum of its proper divisors (96614009251).

2222122212221 is an equidigital number, since it uses as much as digits as its factorization.

2222122212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96614009250.

The product of its digits is 1024, while the sum is 23.

Adding to 2222122212221 its reverse (1222122212222), we get a palindrome (3444244424443).

Subtracting from 2222122212221 its reverse (1222122212222), we obtain a palindrome (999999999999).

The spelling of 2222122212221 in words is "two trillion, two hundred twenty-two billion, one hundred twenty-two million, two hundred twelve thousand, two hundred twenty-one".