211111100012009 has 4 divisors (see below), whose sum is σ = 220289843490816. Its totient is φ = 201932356533204.

The previous prime is 211111100012003. The next prime is 211111100012017. The reversal of 211111100012009 is 900210001111112.

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 a de Polignac number, because none of the positive numbers 2^k-211111100012009 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 (211111100012003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4589371739369 + ... + 4589371739414.

It is an arithmetic number, because the mean of its divisors is an integer number (55072460872704).

Almost surely, 2^{211111100012009} is an apocalyptic number.

It is an amenable number.

211111100012009 is a deficient number, since it is larger than the sum of its proper divisors (9178743478807).

211111100012009 is an equidigital number, since it uses as much as digits as its factorization.

211111100012009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9178743478806.

The product of its (nonzero) digits is 36, while the sum is 20.

The spelling of 211111100012009 in words is "two hundred eleven trillion, one hundred eleven billion, one hundred million, twelve thousand, nine".