21122210211 has 4 divisors (see below), whose sum is σ = 28162946952. Its totient is φ = 14081473472.

The previous prime is 21122210209. The next prime is 21122210297. The reversal of 21122210211 is 11201222112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21122210211 - 2¹ = 21122210209 is a prime.

It is a super-2 number, since 2×21122210211² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122210911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3520368366 + ... + 3520368371.

It is an arithmetic number, because the mean of its divisors is an integer number (7040736738).

Almost surely, 2^21122210211 is an apocalyptic number.

21122210211 is a deficient number, since it is larger than the sum of its proper divisors (7040736741).

21122210211 is an equidigital number, since it uses as much as digits as its factorization.

21122210211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7040736740.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21122210211 its reverse (11201222112), we get a palindrome (32323432323).

The spelling of 21122210211 in words is "twenty-one billion, one hundred twenty-two million, two hundred ten thousand, two hundred eleven".