11311102221 has 4 divisors (see below), whose sum is σ = 15081469632. Its totient is φ = 7540734812.

The previous prime is 11311102189. The next prime is 11311102241. The reversal of 11311102221 is 12220111311.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12220111311 = 3 ⋅4073370437.

It is a cyclic number.

It is not a de Polignac number, because 11311102221 - 2⁵ = 11311102189 is a prime.

It is a super-2 number, since 2×11311102221² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11311102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11311102241) 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, 1885183701 + ... + 1885183706.

It is an arithmetic number, because the mean of its divisors is an integer number (3770367408).

Almost surely, 2^11311102221 is an apocalyptic number.

It is an amenable number.

11311102221 is a deficient number, since it is larger than the sum of its proper divisors (3770367411).

11311102221 is an equidigital number, since it uses as much as digits as its factorization.

11311102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3770367410.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 11311102221 its reverse (12220111311), we get a palindrome (23531213532).

The spelling of 11311102221 in words is "eleven billion, three hundred eleven million, one hundred two thousand, two hundred twenty-one".