121222212012 has 96 divisors (see below), whose sum is σ = 344286028800. Its totient is φ = 36580219200.

The previous prime is 121222211989. The next prime is 121222212019. The reversal of 121222212012 is 210212222121.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (121222212019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70462 + ... + 497402.

It is an arithmetic number, because the mean of its divisors is an integer number (3586312800).

Almost surely, 2^121222212012 is an apocalyptic number.

121222212012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121222212012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172143014400).

121222212012 is an abundant number, since it is smaller than the sum of its proper divisors (223063816788).

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

121222212012 is a wasteful number, since it uses less digits than its factorization.

121222212012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427204 (or 427196 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121222212012 its reverse (210212222121), we get a palindrome (331434434133).

The spelling of 121222212012 in words is "one hundred twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, twelve".