21222122211 has 24 divisors (see below), whose sum is σ = 30757716704. Its totient is φ = 14100376320.

The previous prime is 21222122209. The next prime is 21222122239. The reversal of 21222122211 is 11222122212.

It is a happy number.

21222122211 is a `hidden beast` number, since 212 + 221 + 22 + 211 = 666.

It is not a de Polignac number, because 21222122211 - 2¹ = 21222122209 is a prime.

It is a super-2 number, since 2×21222122211² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222122281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3841131 + ... + 3846651.

Almost surely, 2^21222122211 is an apocalyptic number.

21222122211 is a deficient number, since it is larger than the sum of its proper divisors (9535594493).

21222122211 is a wasteful number, since it uses less digits than its factorization.

21222122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6891 (or 6888 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

Adding to 21222122211 its reverse (11222122212), we get a palindrome (32444244423).

Subtracting from 21222122211 its reverse (11222122212), we obtain a palindrome (9999999999).

It can be divided in two parts, 212221 and 22211, that added together give a palindrome (234432).

The spelling of 21222122211 in words is "twenty-one billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred eleven".