203131421 has 4 divisors (see below), whose sum is σ = 203244672. Its totient is φ = 203018172.

The previous prime is 203131417. The next prime is 203131427. The reversal of 203131421 is 124131302.

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 203131421 - 2² = 203131417 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 203131421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203131427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53891 + ... + 57536.

It is an arithmetic number, because the mean of its divisors is an integer number (50811168).

Almost surely, 2^203131421 is an apocalyptic number.

It is an amenable number.

203131421 is a deficient number, since it is larger than the sum of its proper divisors (113251).

203131421 is a wasteful number, since it uses less digits than its factorization.

203131421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113250.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 203131421 is about 14252.4180755407. The cubic root of 203131421 is about 587.8398658834.

Adding to 203131421 its reverse (124131302), we get a palindrome (327262723).

The spelling of 203131421 in words is "two hundred three million, one hundred thirty-one thousand, four hundred twenty-one".