103520321521 has 4 divisors (see below), whose sum is σ = 103905155700. Its totient is φ = 103135487344.

The previous prime is 103520321519. The next prime is 103520321533. The reversal of 103520321521 is 125123025301.

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 3680120896 + 99840200625 = 60664^2 + 315975^2 .

It is a cyclic number.

It is not a de Polignac number, because 103520321521 - 2¹ = 103520321519 is a prime.

It is a super-3 number, since 3×103520321521³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (103520321501) 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, 192416686 + ... + 192417223.

It is an arithmetic number, because the mean of its divisors is an integer number (25976288925).

Almost surely, 2^103520321521 is an apocalyptic number.

It is an amenable number.

103520321521 is a deficient number, since it is larger than the sum of its proper divisors (384834179).

103520321521 is an equidigital number, since it uses as much as digits as its factorization.

103520321521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384834178.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 103520321521 its reverse (125123025301), we get a palindrome (228643346822).

The spelling of 103520321521 in words is "one hundred three billion, five hundred twenty million, three hundred twenty-one thousand, five hundred twenty-one".