12521567820 has 24 divisors (see below), whose sum is σ = 35060390064. Its totient is φ = 3339084736.

The previous prime is 12521567809. The next prime is 12521567827. The reversal of 12521567820 is 2876512521.

It is not an unprimeable number, because it can be changed into a prime (12521567827) 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, 104346339 + ... + 104346458.

It is an arithmetic number, because the mean of its divisors is an integer number (1460849586).

Almost surely, 2^12521567820 is an apocalyptic number.

12521567820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12521567820 is an abundant number, since it is smaller than the sum of its proper divisors (22538822244).

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

12521567820 is a wasteful number, since it uses less digits than its factorization.

12521567820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208692809 (or 208692807 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 39.

The spelling of 12521567820 in words is "twelve billion, five hundred twenty-one million, five hundred sixty-seven thousand, eight hundred twenty".