212102011113809 has 2 divisors, whose sum is σ = 212102011113810. Its totient is φ = 212102011113808.

The previous prime is 212102011113781. The next prime is 212102011113859. The reversal of 212102011113809 is 908311110201212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190635237213184 + 21466773900625 = 13807072^2 + 4633225^2 .

It is a cyclic number.

It is not a de Polignac number, because 212102011113809 - 2³² = 212097716146513 is a prime.

It is not a weakly prime, because it can be changed into another prime (212102011113859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106051005556904 + 106051005556905.

It is an arithmetic number, because the mean of its divisors is an integer number (106051005556905).

Almost surely, 2^{212102011113809} is an apocalyptic number.

It is an amenable number.

212102011113809 is a deficient number, since it is larger than the sum of its proper divisors (1).

212102011113809 is an equidigital number, since it uses as much as digits as its factorization.

212102011113809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 32.

The spelling of 212102011113809 in words is "two hundred twelve trillion, one hundred two billion, eleven million, one hundred thirteen thousand, eight hundred nine".