221222210 has 16 divisors (see below), whose sum is σ = 434400192. Its totient is φ = 80444400.

The previous prime is 221222203. The next prime is 221222213. The reversal of 221222210 is 12222122.

221222210 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221222213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1005446 + ... + 1005665.

It is an arithmetic number, because the mean of its divisors is an integer number (27150012).

Almost surely, 2^221222210 is an apocalyptic number.

221222210 is a deficient number, since it is larger than the sum of its proper divisors (213177982).

221222210 is a wasteful number, since it uses less digits than its factorization.

221222210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011129.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 221222210 is about 14873.5406006774. The cubic root of 221222210 is about 604.7969265851.

Adding to 221222210 its reverse (12222122), we get a palindrome (233444332).

It can be divided in two parts, 2 and 21222210, that added together give a palindrome (21222212).

The spelling of 221222210 in words is "two hundred twenty-one million, two hundred twenty-two thousand, two hundred ten".