22221122212221 has 8 divisors (see below), whose sum is σ = 31370996064384. Its totient is φ = 13942664917440.

The previous prime is 22221122212169. The next prime is 22221122212229. The reversal of 22221122212221 is 12221222112222.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22221122212221 - 2⁹ = 22221122211709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22221122212191 and 22221122212200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221122212229) 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, 217854139285 + ... + 217854139386.

It is an arithmetic number, because the mean of its divisors is an integer number (3921374508048).

Almost surely, 2^{22221122212221} is an apocalyptic number.

It is an amenable number.

22221122212221 is a deficient number, since it is larger than the sum of its proper divisors (9149873852163).

22221122212221 is a wasteful number, since it uses less digits than its factorization.

22221122212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435708278691.

The product of its digits is 1024, while the sum is 24.

Adding to 22221122212221 its reverse (12221222112222), we get a palindrome (34442344324443).

Subtracting from 22221122212221 its reverse (12221222112222), we obtain a palindrome (9999900099999).

The spelling of 22221122212221 in words is "twenty-two trillion, two hundred twenty-one billion, one hundred twenty-two million, two hundred twelve thousand, two hundred twenty-one".