20111222106 has 64 divisors (see below), whose sum is σ = 47072793600. Its totient is φ = 6346998000.

The previous prime is 20111222083. The next prime is 20111222107. The reversal of 20111222106 is 60122211102.

It is a super-2 number, since 2×20111222106² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20111222107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1976131 + ... + 1986281.

It is an arithmetic number, because the mean of its divisors is an integer number (735512400).

Almost surely, 2^20111222106 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20111222106, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23536396800).

20111222106 is an abundant number, since it is smaller than the sum of its proper divisors (26961571494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20111222106 is a wasteful number, since it uses less digits than its factorization.

20111222106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12112 (or 12106 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 20111222106 its reverse (60122211102), we get a palindrome (80233433208).

The spelling of 20111222106 in words is "twenty billion, one hundred eleven million, two hundred twenty-two thousand, one hundred six".