102444421 has 2 divisors, whose sum is σ = 102444422. Its totient is φ = 102444420.

The previous prime is 102444403. The next prime is 102444427. The reversal of 102444421 is 124444201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77193796 + 25250625 = 8786^2 + 5025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102444421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102444392 and 102444401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102444427) 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, 51222210 + 51222211.

It is an arithmetic number, because the mean of its divisors is an integer number (51222211).

Almost surely, 2^102444421 is an apocalyptic number.

It is an amenable number.

102444421 is a deficient number, since it is larger than the sum of its proper divisors (1).

102444421 is an equidigital number, since it uses as much as digits as its factorization.

102444421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 102444421 is about 10121.4831423068. The cubic root of 102444421 is about 467.9104782259.

Adding to 102444421 its reverse (124444201), we get a palindrome (226888622).

The spelling of 102444421 in words is "one hundred two million, four hundred forty-four thousand, four hundred twenty-one".