31320032021 has 2 divisors, whose sum is σ = 31320032022. Its totient is φ = 31320032020.

The previous prime is 31320031961. The next prime is 31320032033. The reversal of 31320032021 is 12023002313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28194103921 + 3125928100 = 167911^2 + 55910^2 .

It is a cyclic number.

It is not a de Polignac number, because 31320032021 - 2²⁶ = 31252923157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31320032921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660016010 + 15660016011.

It is an arithmetic number, because the mean of its divisors is an integer number (15660016011).

Almost surely, 2^31320032021 is an apocalyptic number.

It is an amenable number.

31320032021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31320032021 is an equidigital number, since it uses as much as digits as its factorization.

31320032021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 31320032021 its reverse (12023002313), we get a palindrome (43343034334).

The spelling of 31320032021 in words is "thirty-one billion, three hundred twenty million, thirty-two thousand, twenty-one".