11212121222 has 4 divisors (see below), whose sum is σ = 16818181836. Its totient is φ = 5606060610.

The previous prime is 11212121209. The next prime is 11212121233. The reversal of 11212121222 is 22212121211.

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

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

It is a self number, because there is not a number n which added to its sum of digits gives 11212121222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2803030304 + ... + 2803030307.

It is an arithmetic number, because the mean of its divisors is an integer number (4204545459).

Almost surely, 2^11212121222 is an apocalyptic number.

11212121222 is a deficient number, since it is larger than the sum of its proper divisors (5606060614).

11212121222 is an equidigital number, since it uses as much as digits as its factorization.

11212121222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5606060613.

The product of its digits is 64, while the sum is 17.

Adding to 11212121222 its reverse (22212121211), we get a palindrome (33424242433).

The spelling of 11212121222 in words is "eleven billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twenty-two".