12222121221221 has 16 divisors (see below), whose sum is σ = 12944687808000. Its totient is φ = 11507616168048.

The previous prime is 12222121221199. The next prime is 12222121221223. The reversal of 12222121221221 is 12212212122221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12222121221221 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 (12222121221223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1508210 + ... + 5169036.

It is an arithmetic number, because the mean of its divisors is an integer number (809042988000).

Almost surely, 2^{12222121221221} is an apocalyptic number.

It is an amenable number.

12222121221221 is a deficient number, since it is larger than the sum of its proper divisors (722566586779).

12222121221221 is a wasteful number, since it uses less digits than its factorization.

12222121221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3661928.

The product of its digits is 512, while the sum is 23.

Adding to 12222121221221 its reverse (12212212122221), we get a palindrome (24434333343442).

The spelling of 12222121221221 in words is "twelve trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".