11111221010999 has 4 divisors (see below), whose sum is σ = 11111565054600. Its totient is φ = 11110876967400.

The previous prime is 11111221010993. The next prime is 11111221011013. The reversal of 11111221010999 is 99901012211111.

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 11111221010999 - 2⁴ = 11111221010983 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 (11111221010993) 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, 171973352 + ... + 172037949.

It is an arithmetic number, because the mean of its divisors is an integer number (2777891263650).

Almost surely, 2^{11111221010999} is an apocalyptic number.

11111221010999 is a deficient number, since it is larger than the sum of its proper divisors (344043601).

11111221010999 is an equidigital number, since it uses as much as digits as its factorization.

11111221010999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344043600.

The product of its (nonzero) digits is 2916, while the sum is 38.

The spelling of 11111221010999 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-one million, ten thousand, nine hundred ninety-nine".