201111111000221 has 4 divisors (see below), whose sum is σ = 201113115536892. Its totient is φ = 201109106463552.

The previous prime is 201111111000119. The next prime is 201111111000223. The reversal of 201111111000221 is 122000111111102.

201111111000221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 63806945805625 + 137304165194596 = 7987925^2 + 11717686^2 .

It is a cyclic number.

It is not a de Polignac number, because 201111111000221 - 2³⁸ = 200836233093277 is a prime.

It is a super-2 number, since 2×201111111000221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201111111000196 and 201111111000205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201111111000223) 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, 1002117836 + ... + 1002318501.

It is an arithmetic number, because the mean of its divisors is an integer number (50278278884223).

Almost surely, 2^{201111111000221} is an apocalyptic number.

It is an amenable number.

201111111000221 is a deficient number, since it is larger than the sum of its proper divisors (2004536671).

201111111000221 is a wasteful number, since it uses less digits than its factorization.

201111111000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2004536670.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 201111111000221 its reverse (122000111111102), we get a palindrome (323111222111323).

The spelling of 201111111000221 in words is "two hundred one trillion, one hundred eleven billion, one hundred eleven million, two hundred twenty-one", and thus it is an aban number.