11101122111221 has 4 divisors (see below), whose sum is σ = 11754129294252. Its totient is φ = 10448114928192.

The previous prime is 11101122111197. The next prime is 11101122111223. The reversal of 11101122111221 is 12211122110111.

11101122111221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7569316035121 + 3531806076100 = 2751239^2 + 1879310^2 .

It is a de Polignac number, because none of the positive numbers 2^k-11101122111221 is a prime.

It is a super-2 number, since 2×11101122111221² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 653007183013 = 11101122111221 / (1 + 1 + 1 + 0 + 1 + 1 + 2 + 2 + 1 + 1 + 1 + 2 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11101122111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11101122111223) 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, 326503591490 + ... + 326503591523.

It is an arithmetic number, because the mean of its divisors is an integer number (2938532323563).

Almost surely, 2^{11101122111221} is an apocalyptic number.

It is an amenable number.

11101122111221 is a deficient number, since it is larger than the sum of its proper divisors (653007183031).

11101122111221 is an equidigital number, since it uses as much as digits as its factorization.

11101122111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653007183030.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 11101122111221 its reverse (12211122110111), we get a palindrome (23312244221332).

The spelling of 11101122111221 in words is "eleven trillion, one hundred one billion, one hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".