121111212222 has 192 divisors, whose sum is σ = 361847775744. Its totient is φ = 28252696320.

The previous prime is 121111212197. The next prime is 121111212281. The reversal of 121111212222 is 222212111121.

121111212222 is a `hidden beast` number, since 121 + 111 + 212 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 = 121111212195 and 121111212204.

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 95 ways as a sum of consecutive naturals, for example, 575833 + ... + 757499.

It is an arithmetic number, because the mean of its divisors is an integer number (1884623832).

Almost surely, 2^121111212222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121111212222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180923887872).

121111212222 is an abundant number, since it is smaller than the sum of its proper divisors (240736563522).

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

121111212222 is a wasteful number, since it uses less digits than its factorization.

121111212222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181743 (or 181740 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 121111212222 its reverse (222212111121), we get a palindrome (343323323343).

It can be divided in two parts, 121111 and 212222, that added together give a palindrome (333333).

The spelling of 121111212222 in words is "one hundred twenty-one billion, one hundred eleven million, two hundred twelve thousand, two hundred twenty-two".