12212500521221 has 64 divisors (see below), whose sum is σ = 16456749281280. Its totient is φ = 8752356771840.

The previous prime is 12212500521073. The next prime is 12212500521283.

12212500521221 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-12212500521221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212500529221) 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 63 ways as a sum of consecutive naturals, for example, 466059506 + ... + 466085708.

It is an arithmetic number, because the mean of its divisors is an integer number (257136707520).

Almost surely, 2^{12212500521221} is an apocalyptic number.

12212500521221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12212500521221 is the 2017631-st octagonal number.

It is an amenable number.

12212500521221 is a deficient number, since it is larger than the sum of its proper divisors (4244248760059).

12212500521221 is a wasteful number, since it uses less digits than its factorization.

12212500521221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27906.

The product of its (nonzero) digits is 1600, while the sum is 26.

It can be divided in two parts, 12212500 and 521221, that added together give a palindrome (12733721).

The spelling of 12212500521221 in words is "twelve trillion, two hundred twelve billion, five hundred million, five hundred twenty-one thousand, two hundred twenty-one".