20121222111111 has 12 divisors (see below), whose sum is σ = 31706168175240. Its totient is φ = 12194680067280.

The previous prime is 20121222110987. The next prime is 20121222111143. The reversal of 20121222111111 is 11111122212102.

It is a happy number.

20121222111111 is a `hidden beast` number, since 201 + 21 + 222 + 111 + 111 = 666.

It is not a de Polignac number, because 20121222111111 - 2¹⁵ = 20121222078343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121222111161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101622333796 + ... + 101622333993.

It is an arithmetic number, because the mean of its divisors is an integer number (2642180681270).

Almost surely, 2^{20121222111111} is an apocalyptic number.

20121222111111 is a deficient number, since it is larger than the sum of its proper divisors (11584946064129).

20121222111111 is a wasteful number, since it uses less digits than its factorization.

20121222111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203244667806 (or 203244667803 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 20121222111111 its reverse (11111122212102), we get a palindrome (31232344323213).

The spelling of 20121222111111 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty-two million, one hundred eleven thousand, one hundred eleven".