31311221103 has 36 divisors (see below), whose sum is σ = 46749601080. Its totient is φ = 20179676448.

The previous prime is 31311221093. The next prime is 31311221131. The reversal of 31311221103 is 30112211313.

31311221103 is a `hidden beast` number, since 31 + 311 + 221 + 103 = 666.

It is not a de Polignac number, because 31311221103 - 2⁴ = 31311221087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311221303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8845708 + ... + 8849246.

It is an arithmetic number, because the mean of its divisors is an integer number (1298600030).

Almost surely, 2^31311221103 is an apocalyptic number.

31311221103 is a deficient number, since it is larger than the sum of its proper divisors (15438379977).

31311221103 is a wasteful number, since it uses less digits than its factorization.

31311221103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3908 (or 3742 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31311221103 its reverse (30112211313), we get a palindrome (61423432416).

The spelling of 31311221103 in words is "thirty-one billion, three hundred eleven million, two hundred twenty-one thousand, one hundred three".