103521542021 has 4 divisors (see below), whose sum is σ = 103618382700. Its totient is φ = 103424701344.

The previous prime is 103521541993. The next prime is 103521542027. The reversal of 103521542021 is 120245125301.

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 68845888225 + 34675653796 = 262385^2 + 186214^2 .

It is a cyclic number.

It is not a de Polignac number, because 103521542021 - 2¹⁸ = 103521279877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103521542027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48418736 + ... + 48420873.

It is an arithmetic number, because the mean of its divisors is an integer number (25904595675).

Almost surely, 2^103521542021 is an apocalyptic number.

It is an amenable number.

103521542021 is a deficient number, since it is larger than the sum of its proper divisors (96840679).

103521542021 is an equidigital number, since it uses as much as digits as its factorization.

103521542021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96840678.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 103521542021 its reverse (120245125301), we get a palindrome (223766667322).

The spelling of 103521542021 in words is "one hundred three billion, five hundred twenty-one million, five hundred forty-two thousand, twenty-one".