21222722211 has 16 divisors (see below), whose sum is σ = 29032462368. Its totient is φ = 13781811200.

The previous prime is 21222722177. The next prime is 21222722237. The reversal of 21222722211 is 11222722212.

It is a cyclic number.

It is not a de Polignac number, because 21222722211 - 2¹¹ = 21222720163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222722291) 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 15 ways as a sum of consecutive naturals, for example, 55746 + ... + 213431.

It is an arithmetic number, because the mean of its divisors is an integer number (1814528898).

Almost surely, 2^21222722211 is an apocalyptic number.

21222722211 is a deficient number, since it is larger than the sum of its proper divisors (7809740157).

21222722211 is a wasteful number, since it uses less digits than its factorization.

21222722211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269862.

The product of its digits is 896, while the sum is 24.

Subtracting from 21222722211 its reverse (11222722212), we obtain a palindrome (9999999999).

The spelling of 21222722211 in words is "twenty-one billion, two hundred twenty-two million, seven hundred twenty-two thousand, two hundred eleven".