12211021222021 has 8 divisors (see below), whose sum is σ = 12258824339160. Its totient is φ = 12163220348928.

The previous prime is 12211021222007. The next prime is 12211021222093. The reversal of 12211021222021 is 12022212011221.

It can be written as a sum of positive squares in 4 ways, for example, as 3264706922500 + 8946314299521 = 1806850^2 + 2991039^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12211021222021 - 2¹³ = 12211021213829 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 12211021222021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211021222721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10792035 + ... + 11869711.

It is an arithmetic number, because the mean of its divisors is an integer number (1532353042395).

Almost surely, 2^{12211021222021} is an apocalyptic number.

It is an amenable number.

12211021222021 is a deficient number, since it is larger than the sum of its proper divisors (47803117139).

12211021222021 is a wasteful number, since it uses less digits than its factorization.

12211021222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122023.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12211021222021 its reverse (12022212011221), we get a palindrome (24233233233242).

The spelling of 12211021222021 in words is "twelve trillion, two hundred eleven billion, twenty-one million, two hundred twenty-two thousand, twenty-one".