31221010201 has 2 divisors, whose sum is σ = 31221010202. Its totient is φ = 31221010200.

The previous prime is 31221010199. The next prime is 31221010217. The reversal of 31221010201 is 10201012213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30354002176 + 867008025 = 174224^2 + 29445^2 .

It is a cyclic number.

It is not a de Polignac number, because 31221010201 - 2¹ = 31221010199 is a prime.

Together with 31221010199, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31221010241) 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, 15610505100 + 15610505101.

It is an arithmetic number, because the mean of its divisors is an integer number (15610505101).

Almost surely, 2^31221010201 is an apocalyptic number.

It is an amenable number.

31221010201 is a deficient number, since it is larger than the sum of its proper divisors (1).

31221010201 is an equidigital number, since it uses as much as digits as its factorization.

31221010201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 31221010201 its reverse (10201012213), we get a palindrome (41422022414).

The spelling of 31221010201 in words is "thirty-one billion, two hundred twenty-one million, ten thousand, two hundred one".