121212222111222 has 128 divisors (see below), whose sum is σ = 273561529651200. Its totient is φ = 35482190486400.

The previous prime is 121212222111199. The next prime is 121212222111269. The reversal of 121212222111222 is 222111222212121.

It is a super-3 number, since 3×121212222111222³ (a number of 43 digits) contains 333 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 121212222111192 and 121212222111201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 275601729 + ... + 276041187.

It is an arithmetic number, because the mean of its divisors is an integer number (2137199450400).

Almost surely, 2^{121212222111222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121212222111222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136780764825600).

121212222111222 is an abundant number, since it is smaller than the sum of its proper divisors (152349307539978).

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

121212222111222 is a wasteful number, since it uses less digits than its factorization.

121212222111222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440322.

The product of its digits is 512, while the sum is 24.

Adding to 121212222111222 its reverse (222111222212121), we get a palindrome (343323444323343).

The spelling of 121212222111222 in words is "one hundred twenty-one trillion, two hundred twelve billion, two hundred twenty-two million, one hundred eleven thousand, two hundred twenty-two".