203042121 has 4 divisors (see below), whose sum is σ = 270722832. Its totient is φ = 135361412.

The previous prime is 203042117. The next prime is 203042123. The reversal of 203042121 is 121240302.

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 a cyclic number.

It is not a de Polignac number, because 203042121 - 2² = 203042117 is a prime.

It is a super-2 number, since 2×203042121² = 82452205800357282, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 203042121.

It is not an unprimeable number, because it can be changed into a prime (203042123) 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, 33840351 + ... + 33840356.

It is an arithmetic number, because the mean of its divisors is an integer number (67680708).

Almost surely, 2^203042121 is an apocalyptic number.

It is an amenable number.

203042121 is a deficient number, since it is larger than the sum of its proper divisors (67680711).

203042121 is an equidigital number, since it uses as much as digits as its factorization.

203042121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67680710.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 203042121 is about 14249.2849294272. The cubic root of 203042121 is about 587.7537118161.

Adding to 203042121 its reverse (121240302), we get a palindrome (324282423).

The spelling of 203042121 in words is "two hundred three million, forty-two thousand, one hundred twenty-one".