211212011200909 has 2 divisors, whose sum is σ = 211212011200910. Its totient is φ = 211212011200908.

The previous prime is 211212011200867. The next prime is 211212011201003. The reversal of 211212011200909 is 909002110212112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209876703842884 + 1335307358025 = 14487122^2 + 1155555^2 .

It is a cyclic number.

It is not a de Polignac number, because 211212011200909 - 2⁷ = 211212011200781 is a prime.

It is a super-2 number, since 2×211212011200909² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211212011200009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105606005600454 + 105606005600455.

It is an arithmetic number, because the mean of its divisors is an integer number (105606005600455).

Almost surely, 2^{211212011200909} is an apocalyptic number.

It is an amenable number.

211212011200909 is a deficient number, since it is larger than the sum of its proper divisors (1).

211212011200909 is an equidigital number, since it uses as much as digits as its factorization.

211212011200909 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 31.

The spelling of 211212011200909 in words is "two hundred eleven trillion, two hundred twelve billion, eleven million, two hundred thousand, nine hundred nine".