103355021521 has 4 divisors (see below), whose sum is σ = 103403297844. Its totient is φ = 103306745200.

The previous prime is 103355021519. The next prime is 103355021527. The reversal of 103355021521 is 125120553301.

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 86930035921 + 16424985600 = 294839^2 + 128160^2 .

It is a cyclic number.

It is not a de Polignac number, because 103355021521 - 2¹ = 103355021519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 103355021521.

It is not an unprimeable number, because it can be changed into a prime (103355021527) 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, 24134950 + ... + 24139231.

It is an arithmetic number, because the mean of its divisors is an integer number (25850824461).

Almost surely, 2^103355021521 is an apocalyptic number.

It is an amenable number.

103355021521 is a deficient number, since it is larger than the sum of its proper divisors (48276323).

103355021521 is an equidigital number, since it uses as much as digits as its factorization.

103355021521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48276322.

The product of its (nonzero) digits is 4500, while the sum is 28.

Adding to 103355021521 its reverse (125120553301), we get a palindrome (228475574822).

The spelling of 103355021521 in words is "one hundred three billion, three hundred fifty-five million, twenty-one thousand, five hundred twenty-one".