11311204221 has 24 divisors (see below), whose sum is σ = 16591575000. Its totient is φ = 7424784000.

The previous prime is 11311204211. The next prime is 11311204237. The reversal of 11311204221 is 12240211311.

It can be written as a sum of positive squares in 4 ways, for example, as 104652900 + 11206551321 = 10230^2 + 105861^2 .

It is not a de Polignac number, because 11311204221 - 2¹⁵ = 11311171453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11311204194 and 11311204203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11311204211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 130155 + ... + 198903.

It is an arithmetic number, because the mean of its divisors is an integer number (691315625).

Almost surely, 2^11311204221 is an apocalyptic number.

It is an amenable number.

11311204221 is a deficient number, since it is larger than the sum of its proper divisors (5280370779).

11311204221 is a wasteful number, since it uses less digits than its factorization.

11311204221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69037 (or 69034 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 11311204221 its reverse (12240211311), we get a palindrome (23551415532).

The spelling of 11311204221 in words is "eleven billion, three hundred eleven million, two hundred four thousand, two hundred twenty-one".