223421403 has 4 divisors (see below), whose sum is σ = 297895208. Its totient is φ = 148947600.

The previous prime is 223421389. The next prime is 223421413. The reversal of 223421403 is 304124322.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 223421403 - 2⁶ = 223421339 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 223421403.

It is not an unprimeable number, because it can be changed into a prime (223421413) 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, 37236898 + ... + 37236903.

It is an arithmetic number, because the mean of its divisors is an integer number (74473802).

Almost surely, 2^223421403 is an apocalyptic number.

223421403 is a deficient number, since it is larger than the sum of its proper divisors (74473805).

223421403 is an equidigital number, since it uses as much as digits as its factorization.

223421403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74473804.

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

The square root of 223421403 is about 14947.2874796734. The cubic root of 223421403 is about 606.7944383630.

Adding to 223421403 its reverse (304124322), we get a palindrome (527545725).

The spelling of 223421403 in words is "two hundred twenty-three million, four hundred twenty-one thousand, four hundred three".