20111221100212 has 24 divisors (see below), whose sum is σ = 39287036571552. Its totient is φ = 8928871946400.

The previous prime is 20111221100171. The next prime is 20111221100221. The reversal of 20111221100212 is 21200112211102.

It is a super-2 number, since 2×20111221100212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5314802839 + ... + 5314806622.

It is an arithmetic number, because the mean of its divisors is an integer number (1636959857148).

Almost surely, 2^{20111221100212} is an apocalyptic number.

20111221100212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20111221100212 is a deficient number, since it is larger than the sum of its proper divisors (19175815471340).

20111221100212 is a wasteful number, since it uses less digits than its factorization.

20111221100212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10629609519 (or 10629609517 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20111221100212 its reverse (21200112211102), we get a palindrome (41311333311314).

The spelling of 20111221100212 in words is "twenty trillion, one hundred eleven billion, two hundred twenty-one million, one hundred thousand, two hundred twelve".