2211111222121 has 4 divisors (see below), whose sum is σ = 2307246492672. Its totient is φ = 2114975951572.

The previous prime is 2211111222107. The next prime is 2211111222161. The reversal of 2211111222121 is 1212221111122.

It is a happy number.

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 2211111222121 - 2⁷ = 2211111221993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2211111222161) 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, 48067635241 + ... + 48067635286.

It is an arithmetic number, because the mean of its divisors is an integer number (576811623168).

Almost surely, 2^{2211111222121} is an apocalyptic number.

It is an amenable number.

2211111222121 is a deficient number, since it is larger than the sum of its proper divisors (96135270551).

2211111222121 is an equidigital number, since it uses as much as digits as its factorization.

2211111222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96135270550.

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

Adding to 2211111222121 its reverse (1212221111122), we get a palindrome (3423332333243).

The spelling of 2211111222121 in words is "two trillion, two hundred eleven billion, one hundred eleven million, two hundred twenty-two thousand, one hundred twenty-one".