12214641221 has 4 divisors (see below), whose sum is σ = 12223577952. Its totient is φ = 12205704492.

The previous prime is 12214641217. The next prime is 12214641233.

12214641221 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 12214641221 - 2² = 12214641217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12214641251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4466315 + ... + 4469048.

It is an arithmetic number, because the mean of its divisors is an integer number (3055894488).

Almost surely, 2^12214641221 is an apocalyptic number.

It is an amenable number.

12214641221 is a deficient number, since it is larger than the sum of its proper divisors (8936731).

12214641221 is an equidigital number, since it uses as much as digits as its factorization.

12214641221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8936730.

The product of its digits is 1536, while the sum is 26.

The spelling of 12214641221 in words is "twelve billion, two hundred fourteen million, six hundred forty-one thousand, two hundred twenty-one".