12211021021221 has 60 divisors (see below), whose sum is σ = 20054729872716. Its totient is φ = 7398944974080.

The previous prime is 12211021021187. The next prime is 12211021021229. The reversal of 12211021021221 is 12212012011221.

12211021021221 is a `hidden beast` number, since 1 + 2 + 211 + 0 + 210 + 21 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9171267128100 + 3039753893121 = 3028410^2 + 1743489^2 .

It is not a de Polignac number, because 12211021021221 - 2⁷ = 12211021021093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12211021021194 and 12211021021203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211021021229) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 43897245 + ... + 44174541.

Almost surely, 2^{12211021021221} is an apocalyptic number.

12211021021221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12211021021221 is a deficient number, since it is larger than the sum of its proper divisors (7843708851495).

12211021021221 is a wasteful number, since it uses less digits than its factorization.

12211021021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281824 (or 281804 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12211021021221 its reverse (12212012011221), we get a palindrome (24423033032442).

The spelling of 12211021021221 in words is "twelve trillion, two hundred eleven billion, twenty-one million, twenty-one thousand, two hundred twenty-one".