201111121022101 has 4 divisors (see below), whose sum is σ = 201111149661100. Its totient is φ = 201111092383104.

The previous prime is 201111121022051. The next prime is 201111121022153. The reversal of 201111121022101 is 101220121111102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 86114966434225 + 114996154587876 = 9279815^2 + 10723626^2 .

It is a cyclic number.

It is not a de Polignac number, because 201111121022101 - 2¹³ = 201111121013909 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 (201111121622101) 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, 4183495 + ... + 20487163.

It is an arithmetic number, because the mean of its divisors is an integer number (50277787415275).

Almost surely, 2^{201111121022101} is an apocalyptic number.

It is an amenable number.

201111121022101 is a deficient number, since it is larger than the sum of its proper divisors (28638999).

201111121022101 is a wasteful number, since it uses less digits than its factorization.

201111121022101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28638998.

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

Adding to 201111121022101 its reverse (101220121111102), we get a palindrome (302331242133203).

The spelling of 201111121022101 in words is "two hundred one trillion, one hundred eleven billion, one hundred twenty-one million, twenty-two thousand, one hundred one".