2221121212211 has 16 divisors (see below), whose sum is σ = 2462853081600. Its totient is φ = 1986027050400.

The previous prime is 2221121212199. The next prime is 2221121212213. The reversal of 2221121212211 is 1122121211222.

It is a cyclic number.

It is not a de Polignac number, because 2221121212211 - 2¹⁰ = 2221121211187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221121212213) 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, 28262870 + ... + 28341348.

It is an arithmetic number, because the mean of its divisors is an integer number (153928317600).

Almost surely, 2^{2221121212211} is an apocalyptic number.

2221121212211 is a deficient number, since it is larger than the sum of its proper divisors (241731869389).

2221121212211 is a wasteful number, since it uses less digits than its factorization.

2221121212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120730.

The product of its digits is 128, while the sum is 20.

Adding to 2221121212211 its reverse (1122121211222), we get a palindrome (3343242423433).

The spelling of 2221121212211 in words is "two trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred twelve thousand, two hundred eleven".