12520322621 has 6 divisors (see below), whose sum is σ = 12792382590. Its totient is φ = 12253930616.

The previous prime is 12520322597. The next prime is 12520322623. The reversal of 12520322621 is 12622302521.

It can be written as a sum of positive squares in only one way, i.e., 12334545721 + 185776900 = 111061^2 + 13630^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12520322621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12520322623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2831726 + ... + 2836143.

It is an arithmetic number, because the mean of its divisors is an integer number (2132063765).

Almost surely, 2^12520322621 is an apocalyptic number.

It is an amenable number.

12520322621 is a deficient number, since it is larger than the sum of its proper divisors (272059969).

12520322621 is an frugal number, since it uses more digits than its factorization.

12520322621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5667963 (or 5667916 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The spelling of 12520322621 in words is "twelve billion, five hundred twenty million, three hundred twenty-two thousand, six hundred twenty-one".