201121112123 has 2 divisors, whose sum is σ = 201121112124. Its totient is φ = 201121112122.

The previous prime is 201121112111. The next prime is 201121112189. The reversal of 201121112123 is 321211121102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201121112123 - 2²² = 201116917819 is a prime.

It is not a weakly prime, because it can be changed into another prime (201121112323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100560556061 + 100560556062.

It is an arithmetic number, because the mean of its divisors is an integer number (100560556062).

Almost surely, 2^201121112123 is an apocalyptic number.

201121112123 is a deficient number, since it is larger than the sum of its proper divisors (1).

201121112123 is an equidigital number, since it uses as much as digits as its factorization.

201121112123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 201121112123 its reverse (321211121102), we get a palindrome (522332233225).

The spelling of 201121112123 in words is "two hundred one billion, one hundred twenty-one million, one hundred twelve thousand, one hundred twenty-three".