31221030110213 has 2 divisors, whose sum is σ = 31221030110214. Its totient is φ = 31221030110212.

The previous prime is 31221030110177. The next prime is 31221030110363. The reversal of 31221030110213 is 31201103012213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22177676025124 + 9043354085089 = 4709318^2 + 3007217^2 .

It is a cyclic number.

It is not a de Polignac number, because 31221030110213 - 2⁴² = 26822983599109 is a prime.

It is a super-2 number, since 2×31221030110213² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31221030610213) 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, 15610515055106 + 15610515055107.

It is an arithmetic number, because the mean of its divisors is an integer number (15610515055107).

Almost surely, 2^{31221030110213} is an apocalyptic number.

It is an amenable number.

31221030110213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31221030110213 is an equidigital number, since it uses as much as digits as its factorization.

31221030110213 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 20.

Adding to 31221030110213 its reverse (31201103012213), we get a palindrome (62422133122426).

The spelling of 31221030110213 in words is "thirty-one trillion, two hundred twenty-one billion, thirty million, one hundred ten thousand, two hundred thirteen".