20012002101209 has 2 divisors, whose sum is σ = 20012002101210. Its totient is φ = 20012002101208.

The previous prime is 20012002101199. The next prime is 20012002101227. The reversal of 20012002101209 is 90210120021002.

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., 12029992791184 + 7982009310025 = 3468428^2 + 2825245^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012002101209 - 2³² = 20007707133913 is a prime.

It is not a weakly prime, because it can be changed into another prime (20012002101239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006001050604 + 10006001050605.

It is an arithmetic number, because the mean of its divisors is an integer number (10006001050605).

Almost surely, 2^{20012002101209} is an apocalyptic number.

It is an amenable number.

20012002101209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012002101209 is an equidigital number, since it uses as much as digits as its factorization.

20012002101209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 20012002101209 in words is "twenty trillion, twelve billion, two million, one hundred one thousand, two hundred nine".