13121142520 has 16 divisors (see below), whose sum is σ = 29522570760. Its totient is φ = 5248456992.

The previous prime is 13121142509. The next prime is 13121142527. The reversal of 13121142520 is 2524112131.

It is a junction number, because it is equal to n+sod(n) for n = 13121142491 and 13121142500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121142527) 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, 164014242 + ... + 164014321.

Almost surely, 2^13121142520 is an apocalyptic number.

13121142520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13121142520 is an abundant number, since it is smaller than the sum of its proper divisors (16401428240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13121142520 is a wasteful number, since it uses less digits than its factorization.

13121142520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328028574 (or 328028570 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 13121142520 its reverse (2524112131), we get a palindrome (15645254651).

The spelling of 13121142520 in words is "thirteen billion, one hundred twenty-one million, one hundred forty-two thousand, five hundred twenty".