201123101121 has 16 divisors (see below), whose sum is σ = 279436089600. Its totient is φ = 128513587328.

The previous prime is 201123101107. The next prime is 201123101143. The reversal of 201123101121 is 121101321102.

It is a cyclic number.

It is not a de Polignac number, because 201123101121 - 2¹⁰ = 201123100097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201123101121.

It is not an unprimeable number, because it can be changed into a prime (201123101171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8425161 + ... + 8448998.

It is an arithmetic number, because the mean of its divisors is an integer number (17464755600).

Almost surely, 2^201123101121 is an apocalyptic number.

It is an amenable number.

201123101121 is a deficient number, since it is larger than the sum of its proper divisors (78312988479).

201123101121 is a wasteful number, since it uses less digits than its factorization.

201123101121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16874328.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 201123101121 its reverse (121101321102), we get a palindrome (322224422223).

The spelling of 201123101121 in words is "two hundred one billion, one hundred twenty-three million, one hundred one thousand, one hundred twenty-one".