222222210 has 64 divisors (see below), whose sum is σ = 611373312. Its totient is φ = 50639616.

The previous prime is 222222193. The next prime is 222222227. The reversal of 222222210 is 12222222.

It is an interprime number because it is at equal distance from previous prime (222222193) and next prime (222222227).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 222222210.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76912 + ... + 79748.

It is an arithmetic number, because the mean of its divisors is an integer number (9552708).

Almost surely, 2^222222210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222222210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305686656).

222222210 is an abundant number, since it is smaller than the sum of its proper divisors (389151102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

222222210 is a wasteful number, since it uses less digits than its factorization.

222222210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3227.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 222222210 is about 14907.1194400528. The cubic root of 222222210 is about 605.7068531728.

Adding to 222222210 its reverse (12222222), we get a palindrome (234444432).

The spelling of 222222210 in words is "two hundred twenty-two million, two hundred twenty-two thousand, two hundred ten".