222202111221 has 80 divisors (see below), whose sum is σ = 357945026560. Its totient is φ = 136943291520.

The previous prime is 222202111199. The next prime is 222202111309. The reversal of 222202111221 is 122111202222.

It is a happy number.

It is not a de Polignac number, because 222202111221 - 2⁵ = 222202111189 is a prime.

It is a super-2 number, since 2×222202111221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222202111194 and 222202111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222202111921) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 11913315 + ... + 11931951.

It is an arithmetic number, because the mean of its divisors is an integer number (4474312832).

Almost surely, 2^222202111221 is an apocalyptic number.

It is an amenable number.

222202111221 is a deficient number, since it is larger than the sum of its proper divisors (135742915339).

222202111221 is a wasteful number, since it uses less digits than its factorization.

222202111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18856 (or 18847 counting only the distinct ones).

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

Adding to 222202111221 its reverse (122111202222), we get a palindrome (344313313443).

The spelling of 222202111221 in words is "two hundred twenty-two billion, two hundred two million, one hundred eleven thousand, two hundred twenty-one".