104521421 has 2 divisors, whose sum is σ = 104521422. Its totient is φ = 104521420.

The previous prime is 104521409. The next prime is 104521427. The reversal of 104521421 is 124125401.

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., 102313225 + 2208196 = 10115^2 + 1486^2 .

It is an emirp because it is prime and its reverse (124125401) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 104521421 - 2⁶ = 104521357 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 = 104521393 and 104521402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (104521427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52260710 + 52260711.

It is an arithmetic number, because the mean of its divisors is an integer number (52260711).

Almost surely, 2^104521421 is an apocalyptic number.

It is an amenable number.

104521421 is a deficient number, since it is larger than the sum of its proper divisors (1).

104521421 is an equidigital number, since it uses as much as digits as its factorization.

104521421 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 20.

The square root of 104521421 is about 10223.5718318013. The cubic root of 104521421 is about 471.0515477982.

Adding to 104521421 its reverse (124125401), we get a palindrome (228646822).

The spelling of 104521421 in words is "one hundred four million, five hundred twenty-one thousand, four hundred twenty-one".