2212111212121 has 16 divisors (see below), whose sum is σ = 2242215967680. Its totient is φ = 2182199201280.

The previous prime is 2212111212089. The next prime is 2212111212131. The reversal of 2212111212121 is 1212121112122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2212111212121 - 2⁵ = 2212111212089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2212111212131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66832786 + ... + 66865876.

It is an arithmetic number, because the mean of its divisors is an integer number (140138497980).

Almost surely, 2^{2212111212121} is an apocalyptic number.

It is an amenable number.

2212111212121 is a deficient number, since it is larger than the sum of its proper divisors (30104755559).

2212111212121 is a wasteful number, since it uses less digits than its factorization.

2212111212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35976.

The product of its digits is 64, while the sum is 19.

Adding to 2212111212121 its reverse (1212121112122), we get a palindrome (3424232324243).

Subtracting from 2212111212121 its reverse (1212121112122), we obtain a palindrome (999990099999).

The spelling of 2212111212121 in words is "two trillion, two hundred twelve billion, one hundred eleven million, two hundred twelve thousand, one hundred twenty-one".