102404221 has 2 divisors, whose sum is σ = 102404222. Its totient is φ = 102404220.

The previous prime is 102404179. The next prime is 102404231. The reversal of 102404221 is 122404201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51638596 + 50765625 = 7186^2 + 7125^2 .

It is a cyclic number.

It is not a de Polignac number, because 102404221 - 2⁹ = 102403709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102404195 and 102404204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102404231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51202110 + 51202111.

It is an arithmetic number, because the mean of its divisors is an integer number (51202111).

Almost surely, 2^102404221 is an apocalyptic number.

It is an amenable number.

102404221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102404221 is an equidigital number, since it uses as much as digits as its factorization.

102404221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 102404221 is about 10119.4970724834. The cubic root of 102404221 is about 467.8492662960.

Adding to 102404221 its reverse (122404201), we get a palindrome (224808422).

The spelling of 102404221 in words is "one hundred two million, four hundred four thousand, two hundred twenty-one".