203421331 has 2 divisors, whose sum is σ = 203421332. Its totient is φ = 203421330.

The previous prime is 203421307. The next prime is 203421389. The reversal of 203421331 is 133124302.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203421331 is a prime.

It is a super-2 number, since 2×203421331² = 82760475811623122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 203421299 and 203421308.

It is not a weakly prime, because it can be changed into another prime (203421431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101710665 + 101710666.

It is an arithmetic number, because the mean of its divisors is an integer number (101710666).

Almost surely, 2^203421331 is an apocalyptic number.

203421331 is a deficient number, since it is larger than the sum of its proper divisors (1).

203421331 is an equidigital number, since it uses as much as digits as its factorization.

203421331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 203421331 is about 14262.5850041288. The cubic root of 203421331 is about 588.1193887720.

Adding to 203421331 its reverse (133124302), we get a palindrome (336545633).

The spelling of 203421331 in words is "two hundred three million, four hundred twenty-one thousand, three hundred thirty-one".