22212222112121 has 8 divisors (see below), whose sum is σ = 23570286929640. Its totient is φ = 20859875463168.

The previous prime is 22212222112079. The next prime is 22212222112141. The reversal of 22212222112121 is 12121122221222.

It can be written as a sum of positive squares in 4 ways, for example, as 6342157236496 + 15870064875625 = 2518364^2 + 3983725^2 .

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 22212222112121 - 2⁶ = 22212222112057 is a prime.

It is a super-2 number, since 2×22212222112121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22212222112141) 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, 1429534136 + ... + 1429549673.

It is an arithmetic number, because the mean of its divisors is an integer number (2946285866205).

Almost surely, 2^{22212222112121} is an apocalyptic number.

It is an amenable number.

22212222112121 is a deficient number, since it is larger than the sum of its proper divisors (1358064817519).

22212222112121 is a wasteful number, since it uses less digits than its factorization.

22212222112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2859084283.

The product of its digits is 512, while the sum is 23.

Adding to 22212222112121 its reverse (12121122221222), we get a palindrome (34333344333343).

The spelling of 22212222112121 in words is "twenty-two trillion, two hundred twelve billion, two hundred twenty-two million, one hundred twelve thousand, one hundred twenty-one".