22221212210 has 32 divisors (see below), whose sum is σ = 42397800192. Its totient is φ = 8356391680.

The previous prime is 22221212201. The next prime is 22221212231. The reversal of 22221212210 is 1221212222.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83129 + ... + 226611.

It is an arithmetic number, because the mean of its divisors is an integer number (1324931256).

Almost surely, 2^22221212210 is an apocalyptic number.

22221212210 is a deficient number, since it is larger than the sum of its proper divisors (20176587982).

22221212210 is a wasteful number, since it uses less digits than its factorization.

22221212210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144418.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22221212210 its reverse (1221212222), we get a palindrome (23442424432).

The spelling of 22221212210 in words is "twenty-two billion, two hundred twenty-one million, two hundred twelve thousand, two hundred ten".