212011221859909 has 2 divisors, whose sum is σ = 212011221859910. Its totient is φ = 212011221859908.

The previous prime is 212011221859907. The next prime is 212011221859919. The reversal of 212011221859909 is 909958122110212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154669268292100 + 57341953567809 = 12436610^2 + 7572447^2 .

It is a cyclic number.

It is not a de Polignac number, because 212011221859909 - 2¹ = 212011221859907 is a prime.

Together with 212011221859907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212011221859907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106005610929954 + 106005610929955.

It is an arithmetic number, because the mean of its divisors is an integer number (106005610929955).

Almost surely, 2^{212011221859909} is an apocalyptic number.

It is an amenable number.

212011221859909 is a deficient number, since it is larger than the sum of its proper divisors (1).

212011221859909 is an equidigital number, since it uses as much as digits as its factorization.

212011221859909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 52.

The spelling of 212011221859909 in words is "two hundred twelve trillion, eleven billion, two hundred twenty-one million, eight hundred fifty-nine thousand, nine hundred nine".