10656324221 has 2 divisors, whose sum is σ = 10656324222. Its totient is φ = 10656324220.

The previous prime is 10656324187. The next prime is 10656324247. The reversal of 10656324221 is 12242365601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10027819321 + 628504900 = 100139^2 + 25070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10656324221 is a prime.

It is a super-2 number, since 2×10656324221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10653324221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5328162110 + 5328162111.

It is an arithmetic number, because the mean of its divisors is an integer number (5328162111).

Almost surely, 2^10656324221 is an apocalyptic number.

It is an amenable number.

10656324221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10656324221 is an equidigital number, since it uses as much as digits as its factorization.

10656324221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 32.

Adding to 10656324221 its reverse (12242365601), we get a palindrome (22898689822).

The spelling of 10656324221 in words is "ten billion, six hundred fifty-six million, three hundred twenty-four thousand, two hundred twenty-one".