201121201123 has 4 divisors (see below), whose sum is σ = 201123311400. Its totient is φ = 201119090848.

The previous prime is 201121201097. The next prime is 201121201129. The reversal of 201121201123 is 321102121102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201121201123 - 2⁹ = 201121200611 is a prime.

It is a super-2 number, since 2×201121201123² (a number of 23 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 = 201121201097 and 201121201106.

It is not an unprimeable number, because it can be changed into a prime (201121201129) 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, 905065 + ... + 1105162.

It is an arithmetic number, because the mean of its divisors is an integer number (50280827850).

Almost surely, 2^201121201123 is an apocalyptic number.

201121201123 is a deficient number, since it is larger than the sum of its proper divisors (2110277).

201121201123 is a wasteful number, since it uses less digits than its factorization.

201121201123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110276.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 201121201123 its reverse (321102121102), we get a palindrome (522223322225).

The spelling of 201121201123 in words is "two hundred one billion, one hundred twenty-one million, two hundred one thousand, one hundred twenty-three".