12512122121521 has 32 divisors (see below), whose sum is σ = 14466450700800. Its totient is φ = 10713236352000.

The previous prime is 12512122121519. The next prime is 12512122121533.

12512122121521 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 12512122121521 - 2¹ = 12512122121519 is a prime.

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 12512122121521.

It is not an unprimeable number, because it can be changed into a prime (12512122121621) 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 31 ways as a sum of consecutive naturals, for example, 113980941 + ... + 114090661.

It is an arithmetic number, because the mean of its divisors is an integer number (452076584400).

Almost surely, 2^{12512122121521} is an apocalyptic number.

12512122121521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12512122121521 is a deficient number, since it is larger than the sum of its proper divisors (1954328579279).

12512122121521 is a wasteful number, since it uses less digits than its factorization.

12512122121521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118521.

The product of its digits is 1600, while the sum is 28.

It can be divided in two parts, 1251212 and 2121521, that added together give a palindrome (3372733).

The spelling of 12512122121521 in words is "twelve trillion, five hundred twelve billion, one hundred twenty-two million, one hundred twenty-one thousand, five hundred twenty-one".