31204421321 has 2 divisors, whose sum is σ = 31204421322. Its totient is φ = 31204421320.

The previous prime is 31204421309. The next prime is 31204421329. The reversal of 31204421321 is 12312440213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27246124096 + 3958297225 = 165064^2 + 62915^2 .

It is a cyclic number.

It is not a de Polignac number, because 31204421321 - 2¹⁴ = 31204404937 is a prime.

It is not a weakly prime, because it can be changed into another prime (31204421329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15602210660 + 15602210661.

It is an arithmetic number, because the mean of its divisors is an integer number (15602210661).

Almost surely, 2^31204421321 is an apocalyptic number.

It is an amenable number.

31204421321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31204421321 is an equidigital number, since it uses as much as digits as its factorization.

31204421321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 31204421321 its reverse (12312440213), we get a palindrome (43516861534).

The spelling of 31204421321 in words is "thirty-one billion, two hundred four million, four hundred twenty-one thousand, three hundred twenty-one".