20111220122212 has 12 divisors (see below), whose sum is σ = 35195509831356. Its totient is φ = 10055360170400.

The previous prime is 20111220122197. The next prime is 20111220122281. The reversal of 20111220122212 is 21222102211102.

It can be written as a sum of positive squares in 2 ways, for example, as 8751799222336 + 11359420899876 = 2958344^2 + 3370374^2 .

It is a super-2 number, since 2×20111220122212² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20111220122212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62291539 + ... + 62613562.

It is an arithmetic number, because the mean of its divisors is an integer number (2932959152613).

Almost surely, 2^{20111220122212} is an apocalyptic number.

It is an amenable number.

20111220122212 is a deficient number, since it is larger than the sum of its proper divisors (15084289709144).

20111220122212 is a wasteful number, since it uses less digits than its factorization.

20111220122212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124945358 (or 124945356 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20111220122212 its reverse (21222102211102), we get a palindrome (41333322333314).

The spelling of 20111220122212 in words is "twenty trillion, one hundred eleven billion, two hundred twenty million, one hundred twenty-two thousand, two hundred twelve".