222221011221 has 16 divisors (see below), whose sum is σ = 359145069120. Its totient is φ = 134679400560.

The previous prime is 222221011153. The next prime is 222221011253. The reversal of 222221011221 is 122110122222.

It is a happy number.

222221011221 is a `hidden beast` number, since 2 + 222 + 210 + 11 + 221 = 666.

It is not a de Polignac number, because 222221011221 - 2¹⁴ = 222220994837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222221011194 and 222221011203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222221011291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 374109150 + ... + 374109743.

It is an arithmetic number, because the mean of its divisors is an integer number (22446566820).

Almost surely, 2^222221011221 is an apocalyptic number.

It is an amenable number.

222221011221 is a deficient number, since it is larger than the sum of its proper divisors (136924057899).

222221011221 is a wasteful number, since it uses less digits than its factorization.

222221011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748218913 (or 748218907 counting only the distinct ones).

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

Adding to 222221011221 its reverse (122110122222), we get a palindrome (344331133443).

The spelling of 222221011221 in words is "two hundred twenty-two billion, two hundred twenty-one million, eleven thousand, two hundred twenty-one".