10565231221 has 2 divisors, whose sum is σ = 10565231222. Its totient is φ = 10565231220.

The previous prime is 10565231197. The next prime is 10565231227. The reversal of 10565231221 is 12213256501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9004112100 + 1561119121 = 94890^2 + 39511^2 .

It is a cyclic number.

It is not a de Polignac number, because 10565231221 - 2⁵ = 10565231189 is a prime.

It is a super-2 number, since 2×10565231221² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 10565231221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10565231227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5282615610 + 5282615611.

It is an arithmetic number, because the mean of its divisors is an integer number (5282615611).

Almost surely, 2^10565231221 is an apocalyptic number.

It is an amenable number.

10565231221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10565231221 is an equidigital number, since it uses as much as digits as its factorization.

10565231221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 10565231221 its reverse (12213256501), we get a palindrome (22778487722).

The spelling of 10565231221 in words is "ten billion, five hundred sixty-five million, two hundred thirty-one thousand, two hundred twenty-one".