111121212121012 has 24 divisors (see below), whose sum is σ = 194488345396800. Its totient is φ = 55553114001216.

The previous prime is 111121212121001. The next prime is 111121212121019. The reversal of 111121212121012 is 210121212121111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121212121019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1016579953 + ... + 1016689255.

It is an arithmetic number, because the mean of its divisors is an integer number (8103681058200).

Almost surely, 2^{111121212121012} is an apocalyptic number.

It is an amenable number.

111121212121012 is a deficient number, since it is larger than the sum of its proper divisors (83367133275788).

111121212121012 is a wasteful number, since it uses less digits than its factorization.

111121212121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141255 (or 141253 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 111121212121012 its reverse (210121212121111), we get a palindrome (321242424242123).

Subtracting 111121212121012 from its reverse (210121212121111), we obtain a palindrome (99000000000099).

The spelling of 111121212121012 in words is "one hundred eleven trillion, one hundred twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, twelve".