221030203 has 4 divisors (see below), whose sum is σ = 224058088. Its totient is φ = 218002320.

The previous prime is 221030179. The next prime is 221030231. The reversal of 221030203 is 302030122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 302030122 = 2 ⋅151015061.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221030203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221030263) 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, 1513833 + ... + 1513978.

It is an arithmetic number, because the mean of its divisors is an integer number (56014522).

Almost surely, 2^221030203 is an apocalyptic number.

221030203 is a deficient number, since it is larger than the sum of its proper divisors (3027885).

221030203 is an equidigital number, since it uses as much as digits as its factorization.

221030203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3027884.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 221030203 is about 14867.0845494334. The cubic root of 221030203 is about 604.6219006746.

Adding to 221030203 its reverse (302030122), we get a palindrome (523060325).

It can be divided in two parts, 22 and 1030203, that added together give a square (1030225 = 1015²).

The spelling of 221030203 in words is "two hundred twenty-one million, thirty thousand, two hundred three".