11211019999 has 4 divisors (see below), whose sum is σ = 11218212720. Its totient is φ = 11203827280.

The previous prime is 11211019991. The next prime is 11211020003. The reversal of 11211019999 is 99991011211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11211019999 - 2³ = 11211019991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211019991) 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, 3594022 + ... + 3597139.

It is an arithmetic number, because the mean of its divisors is an integer number (2804553180).

Almost surely, 2^11211019999 is an apocalyptic number.

11211019999 is a deficient number, since it is larger than the sum of its proper divisors (7192721).

11211019999 is an equidigital number, since it uses as much as digits as its factorization.

11211019999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7192720.

The product of its (nonzero) digits is 13122, while the sum is 43.

The spelling of 11211019999 in words is "eleven billion, two hundred eleven million, nineteen thousand, nine hundred ninety-nine".