201243342101 has 4 divisors (see below), whose sum is σ = 213081185772. Its totient is φ = 189405498432.

The previous prime is 201243342073. The next prime is 201243342119. The reversal of 201243342101 is 101243342102.

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 104183055076 + 97060287025 = 322774^2 + 311545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201243342101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201243342901) 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, 5918921810 + ... + 5918921843.

It is an arithmetic number, because the mean of its divisors is an integer number (53270296443).

Almost surely, 2^201243342101 is an apocalyptic number.

It is an amenable number.

201243342101 is a deficient number, since it is larger than the sum of its proper divisors (11837843671).

201243342101 is a wasteful number, since it uses less digits than its factorization.

201243342101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11837843670.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 201243342101 its reverse (101243342102), we get a palindrome (302486684203).

Subtracting from 201243342101 its reverse (101243342102), we obtain a palindrome (99999999999).

The spelling of 201243342101 in words is "two hundred one billion, two hundred forty-three million, three hundred forty-two thousand, one hundred one".