102544021 has 2 divisors, whose sum is σ = 102544022. Its totient is φ = 102544020.

The previous prime is 102544009. The next prime is 102544027. The reversal of 102544021 is 120445201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97318225 + 5225796 = 9865^2 + 2286^2 .

It is a cyclic number.

It is not a de Polignac number, because 102544021 - 2⁹ = 102543509 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102544021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102544027) 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, 51272010 + 51272011.

It is an arithmetic number, because the mean of its divisors is an integer number (51272011).

Almost surely, 2^102544021 is an apocalyptic number.

It is an amenable number.

102544021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102544021 is an equidigital number, since it uses as much as digits as its factorization.

102544021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 102544021 is about 10126.4021745139. The cubic root of 102544021 is about 468.0620686787.

Adding to 102544021 its reverse (120445201), we get a palindrome (222989222).

The spelling of 102544021 in words is "one hundred two million, five hundred forty-four thousand, twenty-one".