31221312011303 has 16 divisors (see below), whose sum is σ = 32531009280000. Its totient is φ = 29927164653792.

The previous prime is 31221312011299. The next prime is 31221312011311. The reversal of 31221312011303 is 30311021312213.

It is a cyclic number.

It is not a de Polignac number, because 31221312011303 - 2² = 31221312011299 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221312010303) 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 in 15 ways as a sum of consecutive naturals, for example, 329684426 + ... + 329779112.

It is an arithmetic number, because the mean of its divisors is an integer number (2033188080000).

Almost surely, 2^{31221312011303} is an apocalyptic number.

31221312011303 is a deficient number, since it is larger than the sum of its proper divisors (1309697268697).

31221312011303 is a wasteful number, since it uses less digits than its factorization.

31221312011303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176654.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 31221312011303 its reverse (30311021312213), we get a palindrome (61532333323516).

The spelling of 31221312011303 in words is "thirty-one trillion, two hundred twenty-one billion, three hundred twelve million, eleven thousand, three hundred three".