201121111121201 has 4 divisors (see below), whose sum is σ = 201228490253412. Its totient is φ = 201013731988992.

The previous prime is 201121111121129. The next prime is 201121111121219. The reversal of 201121111121201 is 102121111121102.

201121111121201 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 78613314952225 + 122507796168976 = 8866415^2 + 11068324^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201121111121201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201121111121201.

It is not an unprimeable number, because it can be changed into a prime (201121111124201) 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, 53689563296 + ... + 53689567041.

It is an arithmetic number, because the mean of its divisors is an integer number (50307122563353).

Almost surely, 2^{201121111121201} is an apocalyptic number.

It is an amenable number.

201121111121201 is a deficient number, since it is larger than the sum of its proper divisors (107379132211).

201121111121201 is a wasteful number, since it uses less digits than its factorization.

201121111121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107379132210.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 201121111121201 its reverse (102121111121102), we get a palindrome (303242222242303).

Subtracting from 201121111121201 its reverse (102121111121102), we obtain a palindrome (99000000000099).

The spelling of 201121111121201 in words is "two hundred one trillion, one hundred twenty-one billion, one hundred eleven million, one hundred twenty-one thousand, two hundred one".