221220121011112 has 16 divisors (see below), whose sum is σ = 414790108031700. Its totient is φ = 110609425536000.

The previous prime is 221220121011103. The next prime is 221220121011139. The reversal of 221220121011112 is 211110121022122.

It is a happy number.

221220121011112 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 215360497127556 + 5859623883556 = 14675166^2 + 2420666^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221220121011112.

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, 77888889 + ... + 80679112.

Almost surely, 2^{221220121011112} is an apocalyptic number.

It is an amenable number.

221220121011112 is a deficient number, since it is larger than the sum of its proper divisors (193569987020588).

221220121011112 is a wasteful number, since it uses less digits than its factorization.

221220121011112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158742396 (or 158742392 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221220121011112 its reverse (211110121022122), we get a palindrome (432330242033234).

The spelling of 221220121011112 in words is "two hundred twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, eleven thousand, one hundred twelve".