11310312221 has 4 divisors (see below), whose sum is σ = 12180336252. Its totient is φ = 10440288192.

The previous prime is 11310312217. The next prime is 11310312239. The reversal of 11310312221 is 12221301311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12221301311 = 2459 ⋅4970029.

It can be written as a sum of positive squares in 2 ways, for example, as 4440223225 + 6870088996 = 66635^2 + 82886^2 .

It is a cyclic number.

It is not a de Polignac number, because 11310312221 - 2² = 11310312217 is a prime.

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 11310312221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11310312281) 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, 435011996 + ... + 435012021.

It is an arithmetic number, because the mean of its divisors is an integer number (3045084063).

Almost surely, 2^11310312221 is an apocalyptic number.

It is an amenable number.

11310312221 is a deficient number, since it is larger than the sum of its proper divisors (870024031).

11310312221 is an equidigital number, since it uses as much as digits as its factorization.

11310312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870024030.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11310312221 its reverse (12221301311), we get a palindrome (23531613532).

The spelling of 11310312221 in words is "eleven billion, three hundred ten million, three hundred twelve thousand, two hundred twenty-one".