102421057 has 2 divisors, whose sum is σ = 102421058. Its totient is φ = 102421056.

The previous prime is 102421049. The next prime is 102421061. The reversal of 102421057 is 750124201.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102394161 + 26896 = 10119^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 102421057 - 2³ = 102421049 is a prime.

It is not a weakly prime, because it can be changed into another prime (102421757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51210528 + 51210529.

It is an arithmetic number, because the mean of its divisors is an integer number (51210529).

Almost surely, 2^102421057 is an apocalyptic number.

It is an amenable number.

102421057 is a deficient number, since it is larger than the sum of its proper divisors (1).

102421057 is an equidigital number, since it uses as much as digits as its factorization.

102421057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 102421057 is about 10120.3288978175. The cubic root of 102421057 is about 467.8749041670.

Adding to 102421057 its reverse (750124201), we get a palindrome (852545258).

The spelling of 102421057 in words is "one hundred two million, four hundred twenty-one thousand, fifty-seven".