12211002021221 has 4 divisors (see below), whose sum is σ = 12470810574912. Its totient is φ = 11951193467532.

The previous prime is 12211002021209. The next prime is 12211002021269. The reversal of 12211002021221 is 12212020011221.

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 12211002021221 - 2²⁶ = 12210934912357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12211002021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211002021121) 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 3 ways as a sum of consecutive naturals, for example, 129904276775 + ... + 129904276868.

It is an arithmetic number, because the mean of its divisors is an integer number (3117702643728).

Almost surely, 2^{12211002021221} is an apocalyptic number.

It is an amenable number.

12211002021221 is a deficient number, since it is larger than the sum of its proper divisors (259808553691).

12211002021221 is an equidigital number, since it uses as much as digits as its factorization.

12211002021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259808553690.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12211002021221 its reverse (12212020011221), we get a palindrome (24423022032442).

The spelling of 12211002021221 in words is "twelve trillion, two hundred eleven billion, two million, twenty-one thousand, two hundred twenty-one".