21211211222 has 16 divisors (see below), whose sum is σ = 33494339760. Its totient is φ = 10046529792.

The previous prime is 21211211213. The next prime is 21211211227. The reversal of 21211211222 is 22211211212.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21211211222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211211227) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 657338 + ... + 688850.

It is an arithmetic number, because the mean of its divisors is an integer number (2093396235).

Almost surely, 2^21211211222 is an apocalyptic number.

21211211222 is a deficient number, since it is larger than the sum of its proper divisors (12283128538).

21211211222 is a wasteful number, since it uses less digits than its factorization.

21211211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49247.

The product of its digits is 64, while the sum is 17.

Adding to 21211211222 its reverse (22211211212), we get a palindrome (43422422434).

The spelling of 21211211222 in words is "twenty-one billion, two hundred eleven million, two hundred eleven thousand, two hundred twenty-two".