20211221011112 has 8 divisors (see below), whose sum is σ = 37896039395850. Its totient is φ = 10105610505552.

The previous prime is 20211221011103. The next prime is 20211221011127. The reversal of 20211221011112 is 21111012211202.

It can be written as a sum of positive squares in only one way, i.e., 11331262045636 + 8879958965476 = 3366194^2 + 2979926^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1263201313187 + ... + 1263201313202.

Almost surely, 2^{20211221011112} is an apocalyptic number.

It is an amenable number.

20211221011112 is a deficient number, since it is larger than the sum of its proper divisors (17684818384738).

20211221011112 is a wasteful number, since it uses less digits than its factorization.

20211221011112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2526402626395 (or 2526402626391 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20211221011112 its reverse (21111012211202), we get a palindrome (41322233222314).

The spelling of 20211221011112 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-one million, eleven thousand, one hundred twelve".