11211221121222 has 64 divisors (see below), whose sum is σ = 25038926841600. Its totient is φ = 3325731701760.

The previous prime is 11211221121211. The next prime is 11211221121251. The reversal of 11211221121222 is 22212112211211.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 4542072 + ... + 6561467.

It is an arithmetic number, because the mean of its divisors is an integer number (391233231900).

Almost surely, 2^{11211221121222} is an apocalyptic number.

11211221121222 is an abundant number, since it is smaller than the sum of its proper divisors (13827705720378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11211221121222 is a wasteful number, since it uses less digits than its factorization.

11211221121222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11104101.

The product of its digits is 128, while the sum is 21.

Adding to 11211221121222 its reverse (22212112211211), we get a palindrome (33423333332433).

The spelling of 11211221121222 in words is "eleven trillion, two hundred eleven billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-two".