222215121 has 24 divisors (see below), whose sum is σ = 343115136. Its totient is φ = 138240960.

The previous prime is 222215113. The next prime is 222215159. The reversal of 222215121 is 121512222.

It is not a de Polignac number, because 222215121 - 2³ = 222215113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222215094 and 222215103.

It is not an unprimeable number, because it can be changed into a prime (222215171) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4605 + ... + 21578.

It is an arithmetic number, because the mean of its divisors is an integer number (14296464).

Almost surely, 2^222215121 is an apocalyptic number.

It is an amenable number.

222215121 is a deficient number, since it is larger than the sum of its proper divisors (120900015).

222215121 is a wasteful number, since it uses less digits than its factorization.

222215121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26253 (or 26250 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 222215121 is about 14906.8816658616. The cubic root of 222215121 is about 605.7004123201.

Adding to 222215121 its reverse (121512222), we get a palindrome (343727343).

The spelling of 222215121 in words is "two hundred twenty-two million, two hundred fifteen thousand, one hundred twenty-one".