31030443221 has 2 divisors, whose sum is σ = 31030443222. Its totient is φ = 31030443220.

The previous prime is 31030443151. The next prime is 31030443293. The reversal of 31030443221 is 12234403013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30314292100 + 716151121 = 174110^2 + 26761^2 .

It is a cyclic number.

It is not a de Polignac number, because 31030443221 - 2¹⁰ = 31030442197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31030448221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15515221610 + 15515221611.

It is an arithmetic number, because the mean of its divisors is an integer number (15515221611).

Almost surely, 2^31030443221 is an apocalyptic number.

It is an amenable number.

31030443221 is a deficient number, since it is larger than the sum of its proper divisors (1).

31030443221 is an equidigital number, since it uses as much as digits as its factorization.

31030443221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 31030443221 its reverse (12234403013), we get a palindrome (43264846234).

The spelling of 31030443221 in words is "thirty-one billion, thirty million, four hundred forty-three thousand, two hundred twenty-one".