221200232321 has 2 divisors, whose sum is σ = 221200232322. Its totient is φ = 221200232320.

The previous prime is 221200232299. The next prime is 221200232347. The reversal of 221200232321 is 123232002122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195032640625 + 26167591696 = 441625^2 + 161764^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221200232321 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221200232293 and 221200232302.

It is not a weakly prime, because it can be changed into another prime (221203232321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110600116160 + 110600116161.

It is an arithmetic number, because the mean of its divisors is an integer number (110600116161).

Almost surely, 2^221200232321 is an apocalyptic number.

It is an amenable number.

221200232321 is a deficient number, since it is larger than the sum of its proper divisors (1).

221200232321 is an equidigital number, since it uses as much as digits as its factorization.

221200232321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 221200232321 its reverse (123232002122), we get a palindrome (344432234443).

The spelling of 221200232321 in words is "two hundred twenty-one billion, two hundred million, two hundred thirty-two thousand, three hundred twenty-one".