12202020021221 has 4 divisors (see below), whose sum is σ = 12202038420000. Its totient is φ = 12202001622444.

The previous prime is 12202020021187. The next prime is 12202020021293. The reversal of 12202020021221 is 12212002020221.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12202020021221 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 12202020021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12202020041221) 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, 8165891 + ... + 9543888.

It is an arithmetic number, because the mean of its divisors is an integer number (3050509605000).

Almost surely, 2^{12202020021221} is an apocalyptic number.

It is an amenable number.

12202020021221 is a deficient number, since it is larger than the sum of its proper divisors (18398779).

12202020021221 is an equidigital number, since it uses as much as digits as its factorization.

12202020021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18398778.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 12202020021221 its reverse (12212002020221), we get a palindrome (24414022041442).

The spelling of 12202020021221 in words is "twelve trillion, two hundred two billion, twenty million, twenty-one thousand, two hundred twenty-one".