22211121122221 has 8 divisors (see below), whose sum is σ = 22250386678520. Its totient is φ = 22171888747008.

The previous prime is 22211121122209. The next prime is 22211121122297. The reversal of 22211121122221 is 12222112111222.

It can be written as a sum of positive squares in 4 ways, for example, as 648007290121 + 21563113832100 = 804989^2 + 4643610^2 .

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 22211121122221 - 2¹³ = 22211121114029 is a prime.

It is a super-3 number, since 3×22211121122221³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22211121122192 and 22211121122201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22211121122921) 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, 6955116 + ... + 9633061.

It is an arithmetic number, because the mean of its divisors is an integer number (2781298334815).

Almost surely, 2^{22211121122221} is an apocalyptic number.

It is an amenable number.

22211121122221 is a deficient number, since it is larger than the sum of its proper divisors (39265556299).

22211121122221 is a wasteful number, since it uses less digits than its factorization.

22211121122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16590543.

The product of its digits is 256, while the sum is 22.

Adding to 22211121122221 its reverse (12222112111222), we get a palindrome (34433233233443).

The spelling of 22211121122221 in words is "twenty-two trillion, two hundred eleven billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty-one".