201121102123 has 4 divisors (see below), whose sum is σ = 201561192520. Its totient is φ = 200681011728.

The previous prime is 201121102103. The next prime is 201121102129. The reversal of 201121102123 is 321201121102.

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 201121102123 - 2¹³ = 201121093931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201121102097 and 201121102106.

It is not an unprimeable number, because it can be changed into a prime (201121102129) 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, 220044513 + ... + 220045426.

It is an arithmetic number, because the mean of its divisors is an integer number (50390298130).

Almost surely, 2^201121102123 is an apocalyptic number.

201121102123 is a deficient number, since it is larger than the sum of its proper divisors (440090397).

201121102123 is an equidigital number, since it uses as much as digits as its factorization.

201121102123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440090396.

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

Adding to 201121102123 its reverse (321201121102), we get a palindrome (522322223225).

The spelling of 201121102123 in words is "two hundred one billion, one hundred twenty-one million, one hundred two thousand, one hundred twenty-three".