31212102213109 has 2 divisors, whose sum is σ = 31212102213110. Its totient is φ = 31212102213108.

The previous prime is 31212102213101. The next prime is 31212102213137. The reversal of 31212102213109 is 90131220121213.

It is an a-pointer prime, because the next prime (31212102213137) can be obtained adding 31212102213109 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27132118322500 + 4079983890609 = 5208850^2 + 2019897^2 .

It is an emirp because it is prime and its reverse (90131220121213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31212102213109 - 2³ = 31212102213101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31212102213101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606051106554 + 15606051106555.

It is an arithmetic number, because the mean of its divisors is an integer number (15606051106555).

Almost surely, 2^{31212102213109} is an apocalyptic number.

It is an amenable number.

31212102213109 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212102213109 is an equidigital number, since it uses as much as digits as its factorization.

31212102213109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 31212102213109 in words is "thirty-one trillion, two hundred twelve billion, one hundred two million, two hundred thirteen thousand, one hundred nine".