1222122121111 has 4 divisors (see below), whose sum is σ = 1250543565832. Its totient is φ = 1193700676392.

The previous prime is 1222122121079. The next prime is 1222122121139. The reversal of 1222122121111 is 1111212212221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1222122121111 - 2⁵ = 1222122121079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222122161111) 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, 14210722296 + ... + 14210722381.

It is an arithmetic number, because the mean of its divisors is an integer number (312635891458).

Almost surely, 2^{1222122121111} is an apocalyptic number.

1222122121111 is a deficient number, since it is larger than the sum of its proper divisors (28421444721).

1222122121111 is an equidigital number, since it uses as much as digits as its factorization.

1222122121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28421444720.

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

Adding to 1222122121111 its reverse (1111212212221), we get a palindrome (2333334333332).

The spelling of 1222122121111 in words is "one trillion, two hundred twenty-two billion, one hundred twenty-two million, one hundred twenty-one thousand, one hundred eleven".