111121221012 has 12 divisors (see below), whose sum is σ = 259282849056. Its totient is φ = 37040407000.

The previous prime is 111121221007. The next prime is 111121221161. The reversal of 111121221012 is 210122121111.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 111121220982 and 111121221000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4630050864 + ... + 4630050887.

It is an arithmetic number, because the mean of its divisors is an integer number (21606904088).

Almost surely, 2^111121221012 is an apocalyptic number.

111121221012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

111121221012 is an abundant number, since it is smaller than the sum of its proper divisors (148161628044).

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

111121221012 is a wasteful number, since it uses less digits than its factorization.

111121221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9260101758 (or 9260101756 counting only the distinct ones).

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

Adding to 111121221012 its reverse (210122121111), we get a palindrome (321243342123).

Subtracting 111121221012 from its reverse (210122121111), we obtain a palindrome (99000900099).

The spelling of 111121221012 in words is "one hundred eleven billion, one hundred twenty-one million, two hundred twenty-one thousand, twelve".