11220331021 has 2 divisors, whose sum is σ = 11220331022. Its totient is φ = 11220331020.

The previous prime is 11220330997. The next prime is 11220331061. The reversal of 11220331021 is 12013302211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8161134921 + 3059196100 = 90339^2 + 55310^2 .

It is a cyclic number.

It is not a de Polignac number, because 11220331021 - 2⁷ = 11220330893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11220330986 and 11220331004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11220331061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610165510 + 5610165511.

It is an arithmetic number, because the mean of its divisors is an integer number (5610165511).

Almost surely, 2^11220331021 is an apocalyptic number.

It is an amenable number.

11220331021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11220331021 is an equidigital number, since it uses as much as digits as its factorization.

11220331021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 11220331021 its reverse (12013302211), we get a palindrome (23233633232).

The spelling of 11220331021 in words is "eleven billion, two hundred twenty million, three hundred thirty-one thousand, twenty-one".