203431421 has 2 divisors, whose sum is σ = 203431422. Its totient is φ = 203431420.

The previous prime is 203431411. The next prime is 203431427. The reversal of 203431421 is 124134302.

203431421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177928921 + 25502500 = 13339^2 + 5050^2 .

It is a cyclic number.

It is not a de Polignac number, because 203431421 - 2⁶ = 203431357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 203431393 and 203431402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203431427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101715710 + 101715711.

It is an arithmetic number, because the mean of its divisors is an integer number (101715711).

Almost surely, 2^203431421 is an apocalyptic number.

It is an amenable number.

203431421 is a deficient number, since it is larger than the sum of its proper divisors (1).

203431421 is an equidigital number, since it uses as much as digits as its factorization.

203431421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 203431421 is about 14262.9387224373. The cubic root of 203431421 is about 588.1291124762.

Adding to 203431421 its reverse (124134302), we get a palindrome (327565723).

The spelling of 203431421 in words is "two hundred three million, four hundred thirty-one thousand, four hundred twenty-one".