12512021520 has 80 divisors (see below), whose sum is σ = 38982326400. Its totient is φ = 3319759872.

The previous prime is 12512021513. The next prime is 12512021521. The reversal of 12512021520 is 2512021521.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×12512021520² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12512021521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83229 + ... + 178748.

It is an arithmetic number, because the mean of its divisors is an integer number (487279080).

Almost surely, 2^12512021520 is an apocalyptic number.

12512021520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12512021520 is an abundant number, since it is smaller than the sum of its proper divisors (26470304880).

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

12512021520 is a wasteful number, since it uses less digits than its factorization.

12512021520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262192 (or 262186 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

Subtracting from 12512021520 its reverse (2512021521), we obtain a palindrome (9999999999).

The spelling of 12512021520 in words is "twelve billion, five hundred twelve million, twenty-one thousand, five hundred twenty".