20221211012209 has 2 divisors, whose sum is σ = 20221211012210. Its totient is φ = 20221211012208.

The previous prime is 20221211012207. The next prime is 20221211012221. The reversal of 20221211012209 is 90221011212202.

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., 20211498318400 + 9712693809 = 4495720^2 + 98553^2 .

It is a cyclic number.

It is not a de Polignac number, because 20221211012209 - 2¹ = 20221211012207 is a prime.

Together with 20221211012207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20221211012207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110605506104 + 10110605506105.

It is an arithmetic number, because the mean of its divisors is an integer number (10110605506105).

Almost surely, 2^{20221211012209} is an apocalyptic number.

It is an amenable number.

20221211012209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221211012209 is an equidigital number, since it uses as much as digits as its factorization.

20221211012209 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 20221211012209 in words is "twenty trillion, two hundred twenty-one billion, two hundred eleven million, twelve thousand, two hundred nine".