1211331203 has 2 divisors, whose sum is σ = 1211331204. Its totient is φ = 1211331202.

The previous prime is 1211331167. The next prime is 1211331221. The reversal of 1211331203 is 3021331121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1211331203 - 2¹⁸ = 1211069059 is a prime.

It is a super-2 number, since 2×1211331203² = 2934646566722854418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1211331503) 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 as a sum of consecutive naturals, namely, 605665601 + 605665602.

It is an arithmetic number, because the mean of its divisors is an integer number (605665602).

Almost surely, 2^1211331203 is an apocalyptic number.

1211331203 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211331203 is an equidigital number, since it uses as much as digits as its factorization.

1211331203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1211331203 is about 34804.1836996646. The cubic root of 1211331203 is about 1065.9928739578.

Adding to 1211331203 its reverse (3021331121), we get a palindrome (4232662324).

The spelling of 1211331203 in words is "one billion, two hundred eleven million, three hundred thirty-one thousand, two hundred three".