20212122209 has 2 divisors, whose sum is σ = 20212122210. Its totient is φ = 20212122208.

The previous prime is 20212122193. The next prime is 20212122247. The reversal of 20212122209 is 90222121202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18801894400 + 1410227809 = 137120^2 + 37553^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212122209 - 2⁴ = 20212122193 is a prime.

It is not a weakly prime, because it can be changed into another prime (20212122299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106061104 + 10106061105.

It is an arithmetic number, because the mean of its divisors is an integer number (10106061105).

Almost surely, 2^20212122209 is an apocalyptic number.

It is an amenable number.

20212122209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212122209 is an equidigital number, since it uses as much as digits as its factorization.

20212122209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 20212122209 in words is "twenty billion, two hundred twelve million, one hundred twenty-two thousand, two hundred nine".