31231320212101 has 2 divisors, whose sum is σ = 31231320212102. Its totient is φ = 31231320212100.

The previous prime is 31231320212089. The next prime is 31231320212143. The reversal of 31231320212101 is 10121202313213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30771095008900 + 460225203201 = 5547170^2 + 678399^2 .

It is a cyclic number.

It is not a de Polignac number, because 31231320212101 - 2⁵ = 31231320212069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31231320212171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615660106050 + 15615660106051.

It is an arithmetic number, because the mean of its divisors is an integer number (15615660106051).

Almost surely, 2^{31231320212101} is an apocalyptic number.

It is an amenable number.

31231320212101 is a deficient number, since it is larger than the sum of its proper divisors (1).

31231320212101 is an equidigital number, since it uses as much as digits as its factorization.

31231320212101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 31231320212101 its reverse (10121202313213), we get a palindrome (41352522525314).

The spelling of 31231320212101 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred twenty million, two hundred twelve thousand, one hundred one".