2211221221121 has 8 divisors (see below), whose sum is σ = 2429595588000. Its totient is φ = 1995739230240.

The previous prime is 2211221221103. The next prime is 2211221221133. The reversal of 2211221221121 is 1211221221122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2211221221121 - 2⁶ = 2211221221057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2211221221093 and 2211221221102.

It is not an unprimeable number, because it can be changed into a prime (2211221221021) 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 7 ways as a sum of consecutive naturals, for example, 723092396 + ... + 723095453.

It is an arithmetic number, because the mean of its divisors is an integer number (303699448500).

Almost surely, 2^{2211221221121} is an apocalyptic number.

It is an amenable number.

2211221221121 is a deficient number, since it is larger than the sum of its proper divisors (218374366879).

2211221221121 is a wasteful number, since it uses less digits than its factorization.

2211221221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446187999.

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

Adding to 2211221221121 its reverse (1211221221122), we get a palindrome (3422442442243).

Subtracting from 2211221221121 its reverse (1211221221122), we obtain a palindrome (999999999999).

It can be divided in two parts, 2211221 and 221121, that added together give a palindrome (2432342).

The spelling of 2211221221121 in words is "two trillion, two hundred eleven billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-one".