201221201110122 has 12 divisors (see below), whose sum is σ = 435979269071970. Its totient is φ = 67073733703368.

The previous prime is 201221201110091. The next prime is 201221201110123. The reversal of 201221201110122 is 221011102122102.

It can be written as a sum of positive squares in only one way, i.e., 178014060680481 + 23207140429641 = 13342191^2 + 4817379^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 11178955617229 = 201221201110122 / (2 + 0 + 1 + 2 + 2 + 1 + 2 + 0 + 1 + 1 + 1 + 0 + 1 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 201221201110095 and 201221201110104.

It is not an unprimeable number, because it can be changed into a prime (201221201110123) 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 5 ways as a sum of consecutive naturals, for example, 5589477808597 + ... + 5589477808632.

Almost surely, 2^{201221201110122} is an apocalyptic number.

201221201110122 is an abundant number, since it is smaller than the sum of its proper divisors (234758067961848).

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

201221201110122 is a wasteful number, since it uses less digits than its factorization.

201221201110122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11178955617237 (or 11178955617234 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 201221201110122 its reverse (221011102122102), we get a palindrome (422232303232224).

The spelling of 201221201110122 in words is "two hundred one trillion, two hundred twenty-one billion, two hundred one million, one hundred ten thousand, one hundred twenty-two".