31121100203 has 2 divisors, whose sum is σ = 31121100204. Its totient is φ = 31121100202.

The previous prime is 31121100181. The next prime is 31121100239. The reversal of 31121100203 is 30200112113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31121100203 - 2²⁸ = 30852664747 is a prime.

It is not a weakly prime, because it can be changed into another prime (31121103203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560550101 + 15560550102.

It is an arithmetic number, because the mean of its divisors is an integer number (15560550102).

Almost surely, 2^31121100203 is an apocalyptic number.

31121100203 is a deficient number, since it is larger than the sum of its proper divisors (1).

31121100203 is an equidigital number, since it uses as much as digits as its factorization.

31121100203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 31121100203 its reverse (30200112113), we get a palindrome (61321212316).

The spelling of 31121100203 in words is "thirty-one billion, one hundred twenty-one million, one hundred thousand, two hundred three".