12221211211021 has 4 divisors (see below), whose sum is σ = 12221219093472. Its totient is φ = 12221203328572.

The previous prime is 12221211210991. The next prime is 12221211211037. The reversal of 12221211211021 is 12011211212221.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12221211211021 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 12221211211021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221211211421) 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, 759241 + ... + 5001886.

It is an arithmetic number, because the mean of its divisors is an integer number (3055304773368).

Almost surely, 2^{12221211211021} is an apocalyptic number.

It is an amenable number.

12221211211021 is a deficient number, since it is larger than the sum of its proper divisors (7882451).

12221211211021 is an equidigital number, since it uses as much as digits as its factorization.

12221211211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7882450.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 12221211211021 its reverse (12011211212221), we get a palindrome (24232422423242).

The spelling of 12221211211021 in words is "twelve trillion, two hundred twenty-one billion, two hundred eleven million, two hundred eleven thousand, twenty-one".