2221222121221 has 8 divisors (see below), whose sum is σ = 2371939084800. Its totient is φ = 2075446697520.

The previous prime is 2221222121219. The next prime is 2221222121257. The reversal of 2221222121221 is 1221212221222.

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 2221222121221 - 2¹ = 2221222121219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221222121192 and 2221222121201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221222121281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1235384041 + ... + 1235385838.

It is an arithmetic number, because the mean of its divisors is an integer number (296492385600).

Almost surely, 2^{2221222121221} is an apocalyptic number.

It is an amenable number.

2221222121221 is a deficient number, since it is larger than the sum of its proper divisors (150716963579).

2221222121221 is a wasteful number, since it uses less digits than its factorization.

2221222121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2470769939.

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

Adding to 2221222121221 its reverse (1221212221222), we get a palindrome (3442434342443).

The spelling of 2221222121221 in words is "two trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".