12212621221 has 4 divisors (see below), whose sum is σ = 12496635712. Its totient is φ = 11928606732.

The previous prime is 12212621149. The next prime is 12212621227.

12212621221 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12212621221 - 2¹¹ = 12212619173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12212621192 and 12212621201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212621227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142007181 + ... + 142007266.

It is an arithmetic number, because the mean of its divisors is an integer number (3124158928).

Almost surely, 2^12212621221 is an apocalyptic number.

It is an amenable number.

12212621221 is a deficient number, since it is larger than the sum of its proper divisors (284014491).

12212621221 is an equidigital number, since it uses as much as digits as its factorization.

12212621221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284014490.

The product of its digits is 384, while the sum is 22.

The spelling of 12212621221 in words is "twelve billion, two hundred twelve million, six hundred twenty-one thousand, two hundred twenty-one".