212212112209 has 2 divisors, whose sum is σ = 212212112210. Its totient is φ = 212212112208.

The previous prime is 212212112173. The next prime is 212212112261. The reversal of 212212112209 is 902211212212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211834665025 + 377447184 = 460255^2 + 19428^2 .

It is a cyclic number.

It is not a de Polignac number, because 212212112209 - 2²⁵ = 212178557777 is a prime.

It is not a weakly prime, because it can be changed into another prime (212212112909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106106056104 + 106106056105.

It is an arithmetic number, because the mean of its divisors is an integer number (106106056105).

Almost surely, 2^212212112209 is an apocalyptic number.

It is an amenable number.

212212112209 is a deficient number, since it is larger than the sum of its proper divisors (1).

212212112209 is an equidigital number, since it uses as much as digits as its factorization.

212212112209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 212212112209 in words is "two hundred twelve billion, two hundred twelve million, one hundred twelve thousand, two hundred nine".