1221230203 has 4 divisors (see below), whose sum is σ = 1241929080. Its totient is φ = 1200531328.

The previous prime is 1221230189. The next prime is 1221230221. The reversal of 1221230203 is 3020321221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221230203 - 2¹³ = 1221222011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221230273) 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, 10349350 + ... + 10349467.

It is an arithmetic number, because the mean of its divisors is an integer number (310482270).

Almost surely, 2^1221230203 is an apocalyptic number.

1221230203 is a deficient number, since it is larger than the sum of its proper divisors (20698877).

1221230203 is an equidigital number, since it uses as much as digits as its factorization.

1221230203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20698876.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1221230203 is about 34946.1042607041. The cubic root of 1221230203 is about 1068.8887648191. Note that the first 3 decimals are identical.

Adding to 1221230203 its reverse (3020321221), we get a palindrome (4241551424).

The spelling of 1221230203 in words is "one billion, two hundred twenty-one million, two hundred thirty thousand, two hundred three".