103215012521 has 8 divisors (see below), whose sum is σ = 106024170120. Its totient is φ = 100406884608.

The previous prime is 103215012487. The next prime is 103215012569. The reversal of 103215012521 is 125210512301.

It can be written as a sum of positive squares in 4 ways, for example, as 49288884121 + 53926128400 = 222011^2 + 232220^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 103215012521 - 2²⁶ = 103147903657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (103215012821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52016 + ... + 457313.

It is an arithmetic number, because the mean of its divisors is an integer number (13253021265).

Almost surely, 2^103215012521 is an apocalyptic number.

It is an amenable number.

103215012521 is a deficient number, since it is larger than the sum of its proper divisors (2809157599).

103215012521 is an equidigital number, since it uses as much as digits as its factorization.

103215012521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514843.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 103215012521 its reverse (125210512301), we get a palindrome (228425524822).

The spelling of 103215012521 in words is "one hundred three billion, two hundred fifteen million, twelve thousand, five hundred twenty-one".