12221211112021 has 4 divisors (see below), whose sum is σ = 12273662662092. Its totient is φ = 12168759561952.

The previous prime is 12221211112009. The next prime is 12221211112037. The reversal of 12221211112021 is 12021111212221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6724483971921 + 5496727140100 = 2593161^2 + 2344510^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221211112021 - 2²¹ = 12221209014869 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 12221211112021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221211112051) 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, 26225774686 + ... + 26225775151.

It is an arithmetic number, because the mean of its divisors is an integer number (3068415665523).

Almost surely, 2^{12221211112021} is an apocalyptic number.

It is an amenable number.

12221211112021 is a deficient number, since it is larger than the sum of its proper divisors (52451550071).

12221211112021 is an equidigital number, since it uses as much as digits as its factorization.

12221211112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52451550070.

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

Adding to 12221211112021 its reverse (12021111212221), we get a palindrome (24242322324242).

The spelling of 12221211112021 in words is "twelve trillion, two hundred twenty-one billion, two hundred eleven million, one hundred twelve thousand, twenty-one".