103242521 has 4 divisors (see below), whose sum is σ = 103349172. Its totient is φ = 103135872.

The previous prime is 103242509. The next prime is 103242571. The reversal of 103242521 is 125242301.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 90992521 + 12250000 = 9539^2 + 3500^2 .

It is a cyclic number.

It is not a de Polignac number, because 103242521 - 2¹⁸ = 102980377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 103242493 and 103242502.

It is not an unprimeable number, because it can be changed into a prime (103242571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51860 + ... + 53813.

It is an arithmetic number, because the mean of its divisors is an integer number (25837293).

Almost surely, 2^103242521 is an apocalyptic number.

It is an amenable number.

103242521 is a deficient number, since it is larger than the sum of its proper divisors (106651).

103242521 is an equidigital number, since it uses as much as digits as its factorization.

103242521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106650.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 103242521 is about 10160.8326922551. The cubic root of 103242521 is about 469.1224321702.

Adding to 103242521 its reverse (125242301), we get a palindrome (228484822).

The spelling of 103242521 in words is "one hundred three million, two hundred forty-two thousand, five hundred twenty-one".