1311211100203 has 16 divisors (see below), whose sum is σ = 1384912587520. Its totient is φ = 1237979798496.

The previous prime is 1311211100197. The next prime is 1311211100239. The reversal of 1311211100203 is 3020011121131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1311211100203 - 2²¹ = 1311209003051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311211100503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63201850 + ... + 63222592.

It is an arithmetic number, because the mean of its divisors is an integer number (86557036720).

Almost surely, 2^{1311211100203} is an apocalyptic number.

1311211100203 is a deficient number, since it is larger than the sum of its proper divisors (73701487317).

1311211100203 is a wasteful number, since it uses less digits than its factorization.

1311211100203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31906.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 1311211100203 its reverse (3020011121131), we get a palindrome (4331222221334).

The spelling of 1311211100203 in words is "one trillion, three hundred eleven billion, two hundred eleven million, one hundred thousand, two hundred three".