423203421 has 16 divisors (see below), whose sum is σ = 574491008. Its totient is φ = 277041600.

The previous prime is 423203399. The next prime is 423203437. The reversal of 423203421 is 124302324.

It is not a de Polignac number, because 423203421 - 2¹⁵ = 423170653 is a prime.

It is a super-2 number, since 2×423203421² = 358202271092206482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423203441) 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, 131451 + ... + 134631.

It is an arithmetic number, because the mean of its divisors is an integer number (35905688).

Almost surely, 2^423203421 is an apocalyptic number.

It is an amenable number.

423203421 is a deficient number, since it is larger than the sum of its proper divisors (151287587).

423203421 is a wasteful number, since it uses less digits than its factorization.

423203421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3972.

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

The square root of 423203421 is about 20571.9085405317. The cubic root of 423203421 is about 750.7863876156.

Adding to 423203421 its reverse (124302324), we get a palindrome (547505745).

The spelling of 423203421 in words is "four hundred twenty-three million, two hundred three thousand, four hundred twenty-one".