31321212101909 has 2 divisors, whose sum is σ = 31321212101910. Its totient is φ = 31321212101908.

The previous prime is 31321212101897. The next prime is 31321212102071. The reversal of 31321212101909 is 90910121212313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31316928399409 + 4283702500 = 5596153^2 + 65450^2 .

It is a cyclic number.

It is not a de Polignac number, because 31321212101909 - 2³⁶ = 31252492625173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31321212109909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660606050954 + 15660606050955.

It is an arithmetic number, because the mean of its divisors is an integer number (15660606050955).

Almost surely, 2^{31321212101909} is an apocalyptic number.

It is an amenable number.

31321212101909 is a deficient number, since it is larger than the sum of its proper divisors (1).

31321212101909 is an equidigital number, since it uses as much as digits as its factorization.

31321212101909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 35.

The spelling of 31321212101909 in words is "thirty-one trillion, three hundred twenty-one billion, two hundred twelve million, one hundred one thousand, nine hundred nine".