121111212012 has 144 divisors (see below), whose sum is σ = 332591601888. Its totient is φ = 34197811200.

The previous prime is 121111211993. The next prime is 121111212029. The reversal of 121111212012 is 210212111121.

It is a happy number.

It is a super-2 number, since 2×121111212012² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121111211982 and 121111212000.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 63708262 + ... + 63710162.

It is an arithmetic number, because the mean of its divisors is an integer number (2309663902).

Almost surely, 2^121111212012 is an apocalyptic number.

121111212012 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 121111212012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166295800944).

121111212012 is an abundant number, since it is smaller than the sum of its proper divisors (211480389876).

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

121111212012 is a wasteful number, since it uses less digits than its factorization.

121111212012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3136 (or 3127 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121111212012 its reverse (210212111121), we get a palindrome (331323323133).

The spelling of 121111212012 in words is "one hundred twenty-one billion, one hundred eleven million, two hundred twelve thousand, twelve".