121112121012 has 24 divisors (see below), whose sum is σ = 284173696800. Its totient is φ = 40145171616.

The previous prime is 121112121001. The next prime is 121112121029. The reversal of 121112121012 is 210121211121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 121112120982 and 121112121000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28189687 + ... + 28193982.

It is an arithmetic number, because the mean of its divisors is an integer number (11840570700).

Almost surely, 2^121112121012 is an apocalyptic number.

121112121012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121112121012 is an abundant number, since it is smaller than the sum of its proper divisors (163061575788).

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

121112121012 is a wasteful number, since it uses less digits than its factorization.

121112121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56383855 (or 56383853 counting only the distinct ones).

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

Adding to 121112121012 its reverse (210121211121), we get a palindrome (331233332133).

The spelling of 121112121012 in words is "one hundred twenty-one billion, one hundred twelve million, one hundred twenty-one thousand, twelve".