203172121 has 8 divisors (see below), whose sum is σ = 206565120. Its totient is φ = 199799808.

The previous prime is 203172113. The next prime is 203172157. The reversal of 203172121 is 121271302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 203172121 - 2³ = 203172113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203172181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15300 + ... + 25306.

It is an arithmetic number, because the mean of its divisors is an integer number (25820640).

Almost surely, 2^203172121 is an apocalyptic number.

It is an amenable number.

203172121 is a deficient number, since it is larger than the sum of its proper divisors (3392999).

203172121 is a wasteful number, since it uses less digits than its factorization.

203172121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10343.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 203172121 is about 14253.8458319150. The cubic root of 203172121 is about 587.8791236944.

The spelling of 203172121 in words is "two hundred three million, one hundred seventy-two thousand, one hundred twenty-one".