201123400121 has 4 divisors (see below), whose sum is σ = 229855314432. Its totient is φ = 172391485812.

The previous prime is 201123400117. The next prime is 201123400139. The reversal of 201123400121 is 121004321102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 201123400121 - 2² = 201123400117 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 201123400121.

It is not an unprimeable number, because it can be changed into a prime (201123400171) 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, 14365957145 + ... + 14365957158.

It is an arithmetic number, because the mean of its divisors is an integer number (57463828608).

Almost surely, 2^201123400121 is an apocalyptic number.

It is an amenable number.

201123400121 is a deficient number, since it is larger than the sum of its proper divisors (28731914311).

201123400121 is an equidigital number, since it uses as much as digits as its factorization.

201123400121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28731914310.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 201123400121 its reverse (121004321102), we get a palindrome (322127721223).

The spelling of 201123400121 in words is "two hundred one billion, one hundred twenty-three million, four hundred thousand, one hundred twenty-one".