12521321005 has 16 divisors (see below), whose sum is σ = 15824635200. Its totient is φ = 9484905600.

The previous prime is 12521320963. The next prime is 12521321041. The reversal of 12521321005 is 50012312521.

It is not a de Polignac number, because 12521321005 - 2¹³ = 12521312813 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154705 + ... + 221305.

It is an arithmetic number, because the mean of its divisors is an integer number (989039700).

Almost surely, 2^12521321005 is an apocalyptic number.

It is an amenable number.

12521321005 is a deficient number, since it is larger than the sum of its proper divisors (3303314195).

12521321005 is a wasteful number, since it uses less digits than its factorization.

12521321005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68604.

The product of its (nonzero) digits is 600, while the sum is 22.

Adding to 12521321005 its reverse (50012312521), we get a palindrome (62533633526).

The spelling of 12521321005 in words is "twelve billion, five hundred twenty-one million, three hundred twenty-one thousand, five".