1222121122221 has 16 divisors (see below), whose sum is σ = 1679560812864. Its totient is φ = 789991031424.

The previous prime is 1222121122199. The next prime is 1222121122259. The reversal of 1222121122221 is 1222211212221.

It is a de Polignac number, because none of the positive numbers 2^k-1222121122221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222121122421) 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, 34558266 + ... + 34593611.

It is an arithmetic number, because the mean of its divisors is an integer number (104972550804).

Almost surely, 2^{1222121122221} is an apocalyptic number.

It is an amenable number.

1222121122221 is a deficient number, since it is larger than the sum of its proper divisors (457439690643).

1222121122221 is a wasteful number, since it uses less digits than its factorization.

1222121122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69152060.

The product of its digits is 256, while the sum is 21.

Adding to 1222121122221 its reverse (1222211212221), we get a palindrome (2444332334442).

The spelling of 1222121122221 in words is "one trillion, two hundred twenty-two billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty-one".