21002022011209 has 2 divisors, whose sum is σ = 21002022011210. Its totient is φ = 21002022011208.

The previous prime is 21002022011207. The next prime is 21002022011287. The reversal of 21002022011209 is 90211022020012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19126601319609 + 1875420691600 = 4373397^2 + 1369460^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002022011209 - 2¹ = 21002022011207 is a prime.

Together with 21002022011207, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21002022011209.

It is not a weakly prime, because it can be changed into another prime (21002022011207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501011005604 + 10501011005605.

It is an arithmetic number, because the mean of its divisors is an integer number (10501011005605).

Almost surely, 2^{21002022011209} is an apocalyptic number.

It is an amenable number.

21002022011209 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002022011209 is an equidigital number, since it uses as much as digits as its factorization.

21002022011209 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 21002022011209 in words is "twenty-one trillion, two billion, twenty-two million, eleven thousand, two hundred nine".