21202100011209 has 64 divisors (see below), whose sum is σ = 32053608437760. Its totient is φ = 12374953943040.

The previous prime is 21202100011151. The next prime is 21202100011273. The reversal of 21202100011209 is 90211000120212.

It is not a de Polignac number, because 21202100011209 - 2¹¹ = 21202100009161 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21202100011709) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 59349447 + ... + 59705619.

It is an arithmetic number, because the mean of its divisors is an integer number (500837631840).

Almost surely, 2^{21202100011209} is an apocalyptic number.

It is an amenable number.

21202100011209 is a deficient number, since it is larger than the sum of its proper divisors (10851508426551).

21202100011209 is a wasteful number, since it uses less digits than its factorization.

21202100011209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357202.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 21202100011209 in words is "twenty-one trillion, two hundred two billion, one hundred million, eleven thousand, two hundred nine".