203400121 has 4 divisors (see below), whose sum is σ = 215364852. Its totient is φ = 191435392.

The previous prime is 203400103. The next prime is 203400133. The reversal of 203400121 is 121004302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121004302 = 2 ⋅60502151.

It can be written as a sum of positive squares in 2 ways, for example, as 167340096 + 36060025 = 12936^2 + 6005^2 .

It is a cyclic number.

It is not a de Polignac number, because 203400121 - 2⁷ = 203399993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203400101) 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, 5982340 + ... + 5982373.

It is an arithmetic number, because the mean of its divisors is an integer number (53841213).

Almost surely, 2^203400121 is an apocalyptic number.

It is an amenable number.

203400121 is a deficient number, since it is larger than the sum of its proper divisors (11964731).

203400121 is a wasteful number, since it uses less digits than its factorization.

203400121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11964730.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 203400121 is about 14261.8414308952. The cubic root of 203400121 is about 588.0989477073.

Adding to 203400121 its reverse (121004302), we get a palindrome (324404423).

The spelling of 203400121 in words is "two hundred three million, four hundred thousand, one hundred twenty-one".