20011000011209 has 4 divisors (see below), whose sum is σ = 20012778619920. Its totient is φ = 20009221402500.

The previous prime is 20011000011137. The next prime is 20011000011229. The reversal of 20011000011209 is 90211000011002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20011000011209 - 2²⁴ = 20010983233993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20011000011229) 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 3 ways as a sum of consecutive naturals, for example, 889287479 + ... + 889309980.

It is an arithmetic number, because the mean of its divisors is an integer number (5003194654980).

Almost surely, 2^{20011000011209} is an apocalyptic number.

It is an amenable number.

20011000011209 is a deficient number, since it is larger than the sum of its proper divisors (1778608711).

20011000011209 is a wasteful number, since it uses less digits than its factorization.

20011000011209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1778608710.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 20011000011209 in words is "twenty trillion, eleven billion, eleven thousand, two hundred nine".