20121122209 has 2 divisors, whose sum is σ = 20121122210. Its totient is φ = 20121122208.

The previous prime is 20121122183. The next prime is 20121122237. The reversal of 20121122209 is 90222112102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17663739025 + 2457383184 = 132905^2 + 49572^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121122209 - 2²³ = 20112733601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20121122209.

It is not a weakly prime, because it can be changed into another prime (20121122299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060561104 + 10060561105.

It is an arithmetic number, because the mean of its divisors is an integer number (10060561105).

Almost surely, 2^20121122209 is an apocalyptic number.

It is an amenable number.

20121122209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121122209 is an equidigital number, since it uses as much as digits as its factorization.

20121122209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 20121122209 in words is "twenty billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred nine".