203403421 has 16 divisors (see below), whose sum is σ = 229549824. Its totient is φ = 178827264.

The previous prime is 203403413. The next prime is 203403437. The reversal of 203403421 is 124304302.

It is a cyclic number.

It is not a de Polignac number, because 203403421 - 2³ = 203403413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203403401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75520 + ... + 78166.

It is an arithmetic number, because the mean of its divisors is an integer number (14346864).

Almost surely, 2^203403421 is an apocalyptic number.

It is an amenable number.

203403421 is a deficient number, since it is larger than the sum of its proper divisors (26146403).

203403421 is a wasteful number, since it uses less digits than its factorization.

203403421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2940.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 203403421 is about 14261.9571237611. The cubic root of 203403421 is about 588.1021281643.

Adding to 203403421 its reverse (124304302), we get a palindrome (327707723).

The spelling of 203403421 in words is "two hundred three million, four hundred three thousand, four hundred twenty-one".