20123132209 has 2 divisors, whose sum is σ = 20123132210. Its totient is φ = 20123132208.

The previous prime is 20123132191. The next prime is 20123132231. The reversal of 20123132209 is 90223132102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12006023184 + 8117109025 = 109572^2 + 90095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20123132209 is a prime.

It is not a weakly prime, because it can be changed into another prime (20123132279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061566104 + 10061566105.

It is an arithmetic number, because the mean of its divisors is an integer number (10061566105).

Almost surely, 2^20123132209 is an apocalyptic number.

It is an amenable number.

20123132209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123132209 is an equidigital number, since it uses as much as digits as its factorization.

20123132209 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 25.

The spelling of 20123132209 in words is "twenty billion, one hundred twenty-three million, one hundred thirty-two thousand, two hundred nine".