222221210121 has 24 divisors (see below), whose sum is σ = 333317350080. Its totient is φ = 142495021536.

The previous prime is 222221210119. The next prime is 222221210137. The reversal of 222221210121 is 121012122222.

It is a happy number.

222221210121 is a `hidden beast` number, since 222 + 221 + 210 + 12 + 1 = 666.

222221210121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 222221210121 - 2¹ = 222221210119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222221210094 and 222221210103.

It is not an unprimeable number, because it can be changed into a prime (222221210621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1550031 + ... + 1687316.

It is an arithmetic number, because the mean of its divisors is an integer number (13888222920).

Almost surely, 2^222221210121 is an apocalyptic number.

It is an amenable number.

222221210121 is a deficient number, since it is larger than the sum of its proper divisors (111096139959).

222221210121 is a wasteful number, since it uses less digits than its factorization.

222221210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3237645 (or 3237642 counting only the distinct ones).

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

Adding to 222221210121 its reverse (121012122222), we get a palindrome (343233332343).

The spelling of 222221210121 in words is "two hundred twenty-two billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty-one".