20010210021209 has 2 divisors, whose sum is σ = 20010210021210. Its totient is φ = 20010210021208.

The previous prime is 20010210021167. The next prime is 20010210021271. The reversal of 20010210021209 is 90212001201002.

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., 18002879280400 + 2007330740809 = 4242980^2 + 1416803^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20010210021209 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20010210021299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005105010604 + 10005105010605.

It is an arithmetic number, because the mean of its divisors is an integer number (10005105010605).

Almost surely, 2^{20010210021209} is an apocalyptic number.

It is an amenable number.

20010210021209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010210021209 is an equidigital number, since it uses as much as digits as its factorization.

20010210021209 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 20010210021209 in words is "twenty trillion, ten billion, two hundred ten million, twenty-one thousand, two hundred nine".