212221222210 has 32 divisors (see below), whose sum is σ = 387958515120. Its totient is φ = 83573897472.

The previous prime is 212221222207. The next prime is 212221222231. The reversal of 212221222210 is 12222122212.

It can be written as a sum of positive squares in 8 ways, for example, as 49634047369 + 162587174841 = 222787^2 + 403221^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 448929 + ... + 791188.

Almost surely, 2^212221222210 is an apocalyptic number.

212221222210 is a deficient number, since it is larger than the sum of its proper divisors (175737292910).

212221222210 is a wasteful number, since it uses less digits than its factorization.

212221222210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240390.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 212221222210 its reverse (12222122212), we get a palindrome (224443344422).

The spelling of 212221222210 in words is "two hundred twelve billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred ten".