22221221221221 has 8 divisors (see below), whose sum is σ = 32321776321824. Its totient is φ = 13467406800720.

The previous prime is 22221221221189. The next prime is 22221221221223. The reversal of 22221221221221 is 12212212212222.

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 22221221221221 - 2⁵ = 22221221221189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22221221221191 and 22221221221200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221221221223) 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, 336685169986 + ... + 336685170051.

It is an arithmetic number, because the mean of its divisors is an integer number (4040222040228).

Almost surely, 2^{22221221221221} is an apocalyptic number.

It is an amenable number.

22221221221221 is a deficient number, since it is larger than the sum of its proper divisors (10100555100603).

22221221221221 is a wasteful number, since it uses less digits than its factorization.

22221221221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673370340051.

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

Adding to 22221221221221 its reverse (12212212212222), we get a palindrome (34433433433443).

The spelling of 22221221221221 in words is "twenty-two trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".