12513116021 has 4 divisors (see below), whose sum is σ = 14300704032. Its totient is φ = 10725528012.

The previous prime is 12513115973. The next prime is 12513116023. The reversal of 12513116021 is 12061131521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12061131521 = 709 ⋅17011469.

It is a cyclic number.

It is not a de Polignac number, because 12513116021 - 2⁶ = 12513115957 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 (12513116023) 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, 893793995 + ... + 893794008.

It is an arithmetic number, because the mean of its divisors is an integer number (3575176008).

Almost surely, 2^12513116021 is an apocalyptic number.

It is an amenable number.

12513116021 is a deficient number, since it is larger than the sum of its proper divisors (1787588011).

12513116021 is an equidigital number, since it uses as much as digits as its factorization.

12513116021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787588010.

The product of its (nonzero) digits is 360, while the sum is 23.

Adding to 12513116021 its reverse (12061131521), we get a palindrome (24574247542).

The spelling of 12513116021 in words is "twelve billion, five hundred thirteen million, one hundred sixteen thousand, twenty-one".