12122200121221 has 4 divisors (see below), whose sum is σ = 12123400468000. Its totient is φ = 12120999774444.

The previous prime is 12122200121219. The next prime is 12122200121233. The reversal of 12122200121221 is 12212100222121.

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 12122200121221 - 2¹ = 12122200121219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122200121921) 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, 600158241 + ... + 600178438.

It is an arithmetic number, because the mean of its divisors is an integer number (3030850117000).

Almost surely, 2^{12122200121221} is an apocalyptic number.

It is an amenable number.

12122200121221 is a deficient number, since it is larger than the sum of its proper divisors (1200346779).

12122200121221 is a wasteful number, since it uses less digits than its factorization.

12122200121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1200346778.

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

Adding to 12122200121221 its reverse (12212100222121), we get a palindrome (24334300343342).

The spelling of 12122200121221 in words is "twelve trillion, one hundred twenty-two billion, two hundred million, one hundred twenty-one thousand, two hundred twenty-one".