31221322133 has 12 divisors (see below), whose sum is σ = 31875255360. Its totient is φ = 30580134480.

The previous prime is 31221322073. The next prime is 31221322157. The reversal of 31221322133 is 33122312213.

It is a de Polignac number, because none of the positive numbers 2^k-31221322133 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31221322099 and 31221322108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221322933) 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 11 ways as a sum of consecutive naturals, for example, 871766 + ... + 906872.

It is an arithmetic number, because the mean of its divisors is an integer number (2656271280).

Almost surely, 2^31221322133 is an apocalyptic number.

It is an amenable number.

31221322133 is a deficient number, since it is larger than the sum of its proper divisors (653933227).

31221322133 is an equidigital number, since it uses as much as digits as its factorization.

31221322133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35468 (or 35407 counting only the distinct ones).

The product of its digits is 1296, while the sum is 23.

Adding to 31221322133 its reverse (33122312213), we get a palindrome (64343634346).

The spelling of 31221322133 in words is "thirty-one billion, two hundred twenty-one million, three hundred twenty-two thousand, one hundred thirty-three".