221330132321 has 2 divisors, whose sum is σ = 221330132322. Its totient is φ = 221330132320.

The previous prime is 221330132161. The next prime is 221330132363. The reversal of 221330132321 is 123231033122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164239720225 + 57090412096 = 405265^2 + 238936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221330132321 is a prime.

It is not a weakly prime, because it can be changed into another prime (221330132381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110665066160 + 110665066161.

It is an arithmetic number, because the mean of its divisors is an integer number (110665066161).

Almost surely, 2^221330132321 is an apocalyptic number.

It is an amenable number.

221330132321 is a deficient number, since it is larger than the sum of its proper divisors (1).

221330132321 is an equidigital number, since it uses as much as digits as its factorization.

221330132321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 221330132321 its reverse (123231033122), we get a palindrome (344561165443).

The spelling of 221330132321 in words is "two hundred twenty-one billion, three hundred thirty million, one hundred thirty-two thousand, three hundred twenty-one".