1222222121221 has 8 divisors (see below), whose sum is σ = 1287989564544. Its totient is φ = 1157506957200.

The previous prime is 1222222121203. The next prime is 1222222121227. The reversal of 1222222121221 is 1221212222221.

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 1222222121221 - 2⁹ = 1222222120709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1222222121192 and 1222222121201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222222121227) 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, 263067441 + ... + 263072086.

It is an arithmetic number, because the mean of its divisors is an integer number (160998695568).

Almost surely, 2^{1222222121221} is an apocalyptic number.

It is an amenable number.

1222222121221 is a deficient number, since it is larger than the sum of its proper divisors (65767443323).

1222222121221 is a wasteful number, since it uses less digits than its factorization.

1222222121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526139651.

The product of its digits is 512, while the sum is 22.

Adding to 1222222121221 its reverse (1221212222221), we get a palindrome (2443434343442).

The spelling of 1222222121221 in words is "one trillion, two hundred twenty-two billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".