31221230933 has 2 divisors, whose sum is σ = 31221230934. Its totient is φ = 31221230932.

The previous prime is 31221230921. The next prime is 31221231001. The reversal of 31221230933 is 33903212213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17236276369 + 13984954564 = 131287^2 + 118258^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31221230933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31221230896 and 31221230905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31221230233) 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 as a sum of consecutive naturals, namely, 15610615466 + 15610615467.

It is an arithmetic number, because the mean of its divisors is an integer number (15610615467).

Almost surely, 2^31221230933 is an apocalyptic number.

It is an amenable number.

31221230933 is a deficient number, since it is larger than the sum of its proper divisors (1).

31221230933 is an equidigital number, since it uses as much as digits as its factorization.

31221230933 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 29.

The spelling of 31221230933 in words is "thirty-one billion, two hundred twenty-one million, two hundred thirty thousand, nine hundred thirty-three".