11131100221 has 2 divisors, whose sum is σ = 11131100222. Its totient is φ = 11131100220.

The previous prime is 11131100173. The next prime is 11131100243. The reversal of 11131100221 is 12200113111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9806940900 + 1324159321 = 99030^2 + 36389^2 .

It is a cyclic number.

It is not a de Polignac number, because 11131100221 - 2⁷ = 11131100093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11131100021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5565550110 + 5565550111.

It is an arithmetic number, because the mean of its divisors is an integer number (5565550111).

Almost surely, 2^11131100221 is an apocalyptic number.

It is an amenable number.

11131100221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11131100221 is an equidigital number, since it uses as much as digits as its factorization.

11131100221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 11131100221 its reverse (12200113111), we get a palindrome (23331213332).

The spelling of 11131100221 in words is "eleven billion, one hundred thirty-one million, one hundred thousand, two hundred twenty-one".