1211111203 has 4 divisors (see below), whose sum is σ = 1211207400. Its totient is φ = 1211015008.

The previous prime is 1211111201. The next prime is 1211111249. The reversal of 1211111203 is 3021111121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1211111203 - 2¹ = 1211111201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211111201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25753 + ... + 55546.

It is an arithmetic number, because the mean of its divisors is an integer number (302801850).

Almost surely, 2^1211111203 is an apocalyptic number.

1211111203 is a deficient number, since it is larger than the sum of its proper divisors (96197).

1211111203 is an equidigital number, since it uses as much as digits as its factorization.

1211111203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96196.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1211111203 is about 34801.0230165724. The cubic root of 1211111203 is about 1065.9283354207.

Adding to 1211111203 its reverse (3021111121), we get a palindrome (4232222324).

The spelling of 1211111203 in words is "one billion, two hundred eleven million, one hundred eleven thousand, two hundred three".