12512222221521 has 64 divisors (see below), whose sum is σ = 19528857492480. Its totient is φ = 7044918416640.

The previous prime is 12512222221519. The next prime is 12512222221529.

It is a happy number.

12512222221521 is nontrivially palindromic in base 10.

12512222221521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12512222221521 - 2¹ = 12512222221519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12512222221529) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 65935251 + ... + 66124743.

It is an arithmetic number, because the mean of its divisors is an integer number (305138398320).

Almost surely, 2^{12512222221521} is an apocalyptic number.

12512222221521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12512222221521 is a deficient number, since it is larger than the sum of its proper divisors (7016635270959).

12512222221521 is a wasteful number, since it uses less digits than its factorization.

12512222221521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191566.

The product of its digits is 6400, while the sum is 30.

It can be divided in two parts, 1251222 and 2221521, that added together give a palindrome (3472743).

The spelling of 12512222221521 in words is "twelve trillion, five hundred twelve billion, two hundred twenty-two million, two hundred twenty-one thousand, five hundred twenty-one".