12521321004 has 24 divisors (see below), whose sum is σ = 29243776240. Its totient is φ = 4169865024.

The previous prime is 12521320963. The next prime is 12521321041. The reversal of 12521321004 is 40012312521.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 475219 + ... + 500874.

Almost surely, 2^12521321004 is an apocalyptic number.

It is an amenable number.

12521321004 is an abundant number, since it is smaller than the sum of its proper divisors (16722455236).

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

12521321004 is a wasteful number, since it uses less digits than its factorization.

12521321004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977169 (or 977167 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 12521321004 its reverse (40012312521), we get a palindrome (52533633525).

The spelling of 12521321004 in words is "twelve billion, five hundred twenty-one million, three hundred twenty-one thousand, four".