11331323212221 has 12 divisors (see below), whose sum is σ = 16413833628348. Its totient is φ = 7532815428864.

The previous prime is 11331323212207. The next prime is 11331323212277. The reversal of 11331323212221 is 12221232313311.

11331323212221 is a `hidden beast` number, since 1 + 1 + 3 + 313 + 2 + 321 + 2 + 2 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4639069822500 + 6692253389721 = 2153850^2 + 2586939^2 .

It is not a de Polignac number, because 11331323212221 - 2⁹ = 11331323211709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11331323212021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1783333810 + ... + 1783340163.

It is an arithmetic number, because the mean of its divisors is an integer number (1367819469029).

Almost surely, 2^{11331323212221} is an apocalyptic number.

It is an amenable number.

11331323212221 is a deficient number, since it is larger than the sum of its proper divisors (5082510416127).

11331323212221 is a wasteful number, since it uses less digits than its factorization.

11331323212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3566674332 (or 3566674329 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

Adding to 11331323212221 its reverse (12221232313311), we get a palindrome (23552555525532).

The spelling of 11331323212221 in words is "eleven trillion, three hundred thirty-one billion, three hundred twenty-three million, two hundred twelve thousand, two hundred twenty-one".