222220111221 has 12 divisors (see below), whose sum is σ = 324162671820. Its totient is φ = 146679940800.

The previous prime is 222220111133. The next prime is 222220111273. The reversal of 222220111221 is 122111022222.

It is a happy number.

222220111221 is a `hidden beast` number, since 222 + 220 + 1 + 1 + 1 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 137408110596 + 84812000625 = 370686^2 + 291225^2 .

It is not a de Polignac number, because 222220111221 - 2¹⁷ = 222219980149 is a prime.

It is a super-2 number, since 2×222220111221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 222220111194 and 222220111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222220111721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122232376 + ... + 122234193.

It is an arithmetic number, because the mean of its divisors is an integer number (27013555985).

Almost surely, 2^222220111221 is an apocalyptic number.

It is an amenable number.

222220111221 is a deficient number, since it is larger than the sum of its proper divisors (101942560599).

222220111221 is a wasteful number, since it uses less digits than its factorization.

222220111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244466676 (or 244466673 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 222220111221 its reverse (122111022222), we get a palindrome (344331133443).

The spelling of 222220111221 in words is "two hundred twenty-two billion, two hundred twenty million, one hundred eleven thousand, two hundred twenty-one".