203423421 has 4 divisors (see below), whose sum is σ = 271231232. Its totient is φ = 135615612.

The previous prime is 203423357. The next prime is 203423483. The reversal of 203423421 is 124324302.

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 not a de Polignac number, because 203423421 - 2⁶ = 203423357 is a prime.

It is a super-2 number, since 2×203423421² = 82762176422686482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203423221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33903901 + ... + 33903906.

It is an arithmetic number, because the mean of its divisors is an integer number (67807808).

Almost surely, 2^203423421 is an apocalyptic number.

It is an amenable number.

203423421 is a deficient number, since it is larger than the sum of its proper divisors (67807811).

203423421 is an equidigital number, since it uses as much as digits as its factorization.

203423421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67807810.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 203423421 is about 14262.6582725662. The cubic root of 203423421 is about 588.1214029255.

Adding to 203423421 its reverse (124324302), we get a palindrome (327747723).

The spelling of 203423421 in words is "two hundred three million, four hundred twenty-three thousand, four hundred twenty-one".