130521231521 has 4 divisors (see below), whose sum is σ = 131813521044. Its totient is φ = 129228942000.

The previous prime is 130521231497. The next prime is 130521231527. The reversal of 130521231521 is 125132125031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125132125031 = 101 ⋅1238931931.

It can be written as a sum of positive squares in 2 ways, for example, as 107679141025 + 22842090496 = 328145^2 + 151136^2 .

It is a cyclic number.

It is not a de Polignac number, because 130521231521 - 2³⁰ = 129447489697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (130521231527) 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, 646144610 + ... + 646144811.

It is an arithmetic number, because the mean of its divisors is an integer number (32953380261).

Almost surely, 2^130521231521 is an apocalyptic number.

It is an amenable number.

130521231521 is a deficient number, since it is larger than the sum of its proper divisors (1292289523).

130521231521 is a wasteful number, since it uses less digits than its factorization.

130521231521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1292289522.

The product of its (nonzero) digits is 1800, while the sum is 26.

Adding to 130521231521 its reverse (125132125031), we get a palindrome (255653356552).

The spelling of 130521231521 in words is "one hundred thirty billion, five hundred twenty-one million, two hundred thirty-one thousand, five hundred twenty-one".