201112101212221 has 4 divisors (see below), whose sum is σ = 201112136579452. Its totient is φ = 201112065844992.

The previous prime is 201112101212159. The next prime is 201112101212233. The reversal of 201112101212221 is 122212101211102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 166692629902500 + 34419471309721 = 12910950^2 + 5866811^2 .

It is a cyclic number.

It is not a de Polignac number, because 201112101212221 - 2⁹ = 201112101211709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201112101212261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7004196 + ... + 21243421.

It is an arithmetic number, because the mean of its divisors is an integer number (50278034144863).

Almost surely, 2^{201112101212221} is an apocalyptic number.

It is an amenable number.

201112101212221 is a deficient number, since it is larger than the sum of its proper divisors (35367231).

201112101212221 is an equidigital number, since it uses as much as digits as its factorization.

201112101212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35367230.

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

Adding to 201112101212221 its reverse (122212101211102), we get a palindrome (323324202423323).

The spelling of 201112101212221 in words is "two hundred one trillion, one hundred twelve billion, one hundred one million, two hundred twelve thousand, two hundred twenty-one".