20111222211 has 4 divisors (see below), whose sum is σ = 26814962952.
Its totient is φ = 13407481472.
The previous prime is 20111222203. The next prime is 20111222233. The reversal of 20111222211 is 11222211102.
Adding to 20111222211 its reverse (11222211102), we get a palindrome (31333433313).
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 20111222211 - 23 = 20111222203 is a prime.
It is a super-2 number, since 2×201112222112 (a number of 21 digits) contains 22 as substring.
It is not an unprimeable number, because it can be changed into a prime (20111222251) 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 3 ways as a sum of consecutive naturals, for example, 3351870366 + ... + 3351870371.
It is an arithmetic number, because the mean of its divisors is an integer number (6703740738).
Almost surely, 220111222211 is an apocalyptic number.
20111222211 is a deficient number, since it is larger than the sum of its proper divisors (6703740741).
20111222211 is an equidigital number, since it uses as much as digits as its factorization.
20111222211 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 6703740740.
The product of its (nonzero) digits is 32, while the sum is 15.
The spelling of 20111222211 in words is "twenty billion, one hundred eleven million, two hundred twenty-two thousand, two hundred eleven".