21100202001209 has 8 divisors (see below), whose sum is σ = 21450748043520. Its totient is φ = 20751138184000.

The previous prime is 21100202001181. The next prime is 21100202001259. The reversal of 21100202001209 is 90210020200112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21100202001209 - 2⁸ = 21100202000953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100202001259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 370527569 + ... + 370584510.

It is an arithmetic number, because the mean of its divisors is an integer number (2681343505440).

Almost surely, 2^{21100202001209} is an apocalyptic number.

It is an amenable number.

21100202001209 is a deficient number, since it is larger than the sum of its proper divisors (350546042311).

21100202001209 is an equidigital number, since it uses as much as digits as its factorization.

21100202001209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741112551.

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

The spelling of 21100202001209 in words is "twenty-one trillion, one hundred billion, two hundred two million, one thousand, two hundred nine".