11321131021 has 2 divisors, whose sum is σ = 11321131022. Its totient is φ = 11321131020.

The previous prime is 11321131009. The next prime is 11321131037. The reversal of 11321131021 is 12013112311.

It is a happy number.

It is an a-pointer prime, because the next prime (11321131037) can be obtained adding 11321131021 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10956855625 + 364275396 = 104675^2 + 19086^2 .

It is a cyclic number.

It is not a de Polignac number, because 11321131021 - 2¹³ = 11321122829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11321130986 and 11321131004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11321132021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5660565510 + 5660565511.

It is an arithmetic number, because the mean of its divisors is an integer number (5660565511).

Almost surely, 2^11321131021 is an apocalyptic number.

It is an amenable number.

11321131021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11321131021 is an equidigital number, since it uses as much as digits as its factorization.

11321131021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 11321131021 its reverse (12013112311), we get a palindrome (23334243332).

The spelling of 11321131021 in words is "eleven billion, three hundred twenty-one million, one hundred thirty-one thousand, twenty-one".