20111220012012 has 24 divisors (see below), whose sum is σ = 46926328075200. Its totient is φ = 6703718854416.

The previous prime is 20111220011983. The next prime is 20111220012019. The reversal of 20111220012012 is 21021002211102.

It is a super-2 number, since 2×20111220012012² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20111220011982 and 20111220012000.

It is not an unprimeable number, because it can be changed into a prime (20111220012019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1589539 + ... + 6538277.

It is an arithmetic number, because the mean of its divisors is an integer number (1955263669800).

Almost surely, 2^{20111220012012} is an apocalyptic number.

It is an amenable number.

20111220012012 is an abundant number, since it is smaller than the sum of its proper divisors (26815108063188).

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

20111220012012 is a wasteful number, since it uses less digits than its factorization.

20111220012012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5287405 (or 5287403 counting only the distinct ones).

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

Adding to 20111220012012 its reverse (21021002211102), we get a palindrome (41132222223114).

The spelling of 20111220012012 in words is "twenty trillion, one hundred eleven billion, two hundred twenty million, twelve thousand, twelve".