102221321 has 2 divisors, whose sum is σ = 102221322. Its totient is φ = 102221320.

The previous prime is 102221309. The next prime is 102221377. The reversal of 102221321 is 123122201.

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., 92833225 + 9388096 = 9635^2 + 3064^2 .

It is a cyclic number.

It is not a de Polignac number, because 102221321 - 2⁶ = 102221257 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 = 102221296 and 102221305.

It is not a weakly prime, because it can be changed into another prime (102224321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51110660 + 51110661.

It is an arithmetic number, because the mean of its divisors is an integer number (51110661).

Almost surely, 2^102221321 is an apocalyptic number.

It is an amenable number.

102221321 is a deficient number, since it is larger than the sum of its proper divisors (1).

102221321 is an equidigital number, since it uses as much as digits as its factorization.

102221321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 102221321 is about 10110.4560233453. The cubic root of 102221321 is about 467.5705648104.

Adding to 102221321 its reverse (123122201), we get a palindrome (225343522).

The spelling of 102221321 in words is "one hundred two million, two hundred twenty-one thousand, three hundred twenty-one".