11211212099 has 4 divisors (see below), whose sum is σ = 11227025520. Its totient is φ = 11195398680.

The previous prime is 11211212053. The next prime is 11211212123. The reversal of 11211212099 is 99021211211.

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 11211212099 - 2²⁴ = 11194434883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11211212009) 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, 7905647 + ... + 7907064.

It is an arithmetic number, because the mean of its divisors is an integer number (2806756380).

Almost surely, 2^11211212099 is an apocalyptic number.

11211212099 is a deficient number, since it is larger than the sum of its proper divisors (15813421).

11211212099 is an equidigital number, since it uses as much as digits as its factorization.

11211212099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15813420.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 11211212099 in words is "eleven billion, two hundred eleven million, two hundred twelve thousand, ninety-nine".