221112121012 has 12 divisors (see below), whose sum is σ = 393504622560. Its totient is φ = 108682228856.

The previous prime is 221112120973. The next prime is 221112121019. The reversal of 221112121012 is 210121211122.

221112121012 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221112121019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 468457648 + ... + 468458119.

It is an arithmetic number, because the mean of its divisors is an integer number (32792051880).

Almost surely, 2^221112121012 is an apocalyptic number.

It is an amenable number.

221112121012 is a deficient number, since it is larger than the sum of its proper divisors (172392501548).

221112121012 is a wasteful number, since it uses less digits than its factorization.

221112121012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936915830 (or 936915828 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221112121012 its reverse (210121211122), we get a palindrome (431233332134).

The spelling of 221112121012 in words is "two hundred twenty-one billion, one hundred twelve million, one hundred twenty-one thousand, twelve".