21222022211 has 8 divisors (see below), whose sum is σ = 22866061680. Its totient is φ = 19579636512.

The previous prime is 21222022153. The next prime is 21222022223. The reversal of 21222022211 is 11222022212.

It is a happy number.

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 21222022211 - 2⁶ = 21222022147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21222022211.

It is not an unprimeable number, because it can be changed into a prime (21222022231) 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, 386720 + ... + 438173.

It is an arithmetic number, because the mean of its divisors is an integer number (2858257710).

Almost surely, 2^21222022211 is an apocalyptic number.

21222022211 is a deficient number, since it is larger than the sum of its proper divisors (1644039469).

21222022211 is a wasteful number, since it uses less digits than its factorization.

21222022211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826885.

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

Adding to 21222022211 its reverse (11222022212), we get a palindrome (32444044423).

Subtracting from 21222022211 its reverse (11222022212), we obtain a palindrome (9999999999).

The spelling of 21222022211 in words is "twenty-one billion, two hundred twenty-two million, twenty-two thousand, two hundred eleven".