1211223203 has 4 divisors (see below), whose sum is σ = 1213874040. Its totient is φ = 1208572368.

The previous prime is 1211223197. The next prime is 1211223241. The reversal of 1211223203 is 3023221121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3023221121 = 107 ⋅28254403.

It is a cyclic number.

It is not a de Polignac number, because 1211223203 - 2⁴ = 1211223187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211223283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1324733 + ... + 1325646.

It is an arithmetic number, because the mean of its divisors is an integer number (303468510).

Almost surely, 2^1211223203 is an apocalyptic number.

1211223203 is a deficient number, since it is larger than the sum of its proper divisors (2650837).

1211223203 is an equidigital number, since it uses as much as digits as its factorization.

1211223203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2650836.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1211223203 is about 34802.6321274699. The cubic root of 1211223203 is about 1065.9611923798.

Adding to 1211223203 its reverse (3023221121), we get a palindrome (4234444324).

The spelling of 1211223203 in words is "one billion, two hundred eleven million, two hundred twenty-three thousand, two hundred three".