12221222002221 has 4 divisors (see below), whose sum is σ = 16294962669632. Its totient is φ = 8147481334812.

The previous prime is 12221222002151. The next prime is 12221222002229. The reversal of 12221222002221 is 12220022212221.

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 not a de Polignac number, because 12221222002221 - 2²³ = 12221213613613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221222002229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2036870333701 + ... + 2036870333706.

It is an arithmetic number, because the mean of its divisors is an integer number (4073740667408).

Almost surely, 2^{12221222002221} is an apocalyptic number.

It is an amenable number.

12221222002221 is a deficient number, since it is larger than the sum of its proper divisors (4073740667411).

12221222002221 is an equidigital number, since it uses as much as digits as its factorization.

12221222002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4073740667410.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 12221222002221 its reverse (12220022212221), we get a palindrome (24441244214442).

The spelling of 12221222002221 in words is "twelve trillion, two hundred twenty-one billion, two hundred twenty-two million, two thousand, two hundred twenty-one".