222112111221221 has 8 divisors (see below), whose sum is σ = 240411859551864. Its totient is φ = 203985820221120.

The previous prime is 222112111221167. The next prime is 222112111221251. The reversal of 222112111221221 is 122122111211222.

It can be written as a sum of positive squares in 4 ways, for example, as 29554553688100 + 192557557533121 = 5436410^2 + 13876511^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222112111221221 is a prime.

It is a super-2 number, since 2×222112111221221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222112111221251) 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, 43364329970 + ... + 43364335091.

It is an arithmetic number, because the mean of its divisors is an integer number (30051482443983).

Almost surely, 2^{222112111221221} is an apocalyptic number.

It is an amenable number.

222112111221221 is a deficient number, since it is larger than the sum of its proper divisors (18299748330643).

222112111221221 is a wasteful number, since it uses less digits than its factorization.

222112111221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86728665271.

The product of its digits is 256, while the sum is 23.

Adding to 222112111221221 its reverse (122122111211222), we get a palindrome (344234222432443).

Subtracting from 222112111221221 its reverse (122122111211222), we obtain a palindrome (99990000009999).

The spelling of 222112111221221 in words is "two hundred twenty-two trillion, one hundred twelve billion, one hundred eleven million, two hundred twenty-one thousand, two hundred twenty-one".