21222222211 has 8 divisors (see below), whose sum is σ = 21669980544. Its totient is φ = 20776217280.

The previous prime is 21222222209. The next prime is 21222222223. The reversal of 21222222211 is 11222222212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21222222211 - 2¹ = 21222222209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222222811) 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, 413875 + ... + 462316.

It is an arithmetic number, because the mean of its divisors is an integer number (2708747568).

Almost surely, 2^21222222211 is an apocalyptic number.

21222222211 is a deficient number, since it is larger than the sum of its proper divisors (447758333).

21222222211 is an equidigital number, since it uses as much as digits as its factorization.

21222222211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876701.

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

Adding to 21222222211 its reverse (11222222212), we get a palindrome (32444444423).

Subtracting from 21222222211 its reverse (11222222212), we obtain a palindrome (9999999999).

The spelling of 21222222211 in words is "twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred eleven".