12525161221 has 16 divisors (see below), whose sum is σ = 13220573184. Its totient is φ = 11842745904.

The previous prime is 12525161141. The next prime is 12525161239. The reversal of 12525161221 is 12216152521.

12525161221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12525161221 - 2¹⁷ = 12525030149 is a prime.

It is a super-2 number, since 2×12525161221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12525161221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12525161821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1386100 + ... + 1395106.

It is an arithmetic number, because the mean of its divisors is an integer number (826285824).

Almost surely, 2^12525161221 is an apocalyptic number.

It is an amenable number.

12525161221 is a deficient number, since it is larger than the sum of its proper divisors (695411963).

12525161221 is a wasteful number, since it uses less digits than its factorization.

12525161221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9720.

The product of its digits is 2400, while the sum is 28.

The spelling of 12525161221 in words is "twelve billion, five hundred twenty-five million, one hundred sixty-one thousand, two hundred twenty-one".