1222122221011 has 4 divisors (see below), whose sum is σ = 1222145880912. Its totient is φ = 1222098561112.

The previous prime is 1222122220967. The next prime is 1222122221027. The reversal of 1222122221011 is 1101222212221.

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 1222122221011 - 2⁹ = 1222122220499 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1222122221011.

It is not an unprimeable number, because it can be changed into a prime (1222122281011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11752300 + ... + 11855833.

It is an arithmetic number, because the mean of its divisors is an integer number (305536470228).

Almost surely, 2^{1222122221011} is an apocalyptic number.

1222122221011 is a deficient number, since it is larger than the sum of its proper divisors (23659901).

1222122221011 is an equidigital number, since it uses as much as digits as its factorization.

1222122221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23659900.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1222122221011 its reverse (1101222212221), we get a palindrome (2323344433232).

The spelling of 1222122221011 in words is "one trillion, two hundred twenty-two billion, one hundred twenty-two million, two hundred twenty-one thousand, eleven".