21012220111112 has 32 divisors (see below), whose sum is σ = 39709228907520. Its totient is φ = 10423096971840.

The previous prime is 21012220111007. The next prime is 21012220111151. The reversal of 21012220111112 is 21111102221012.

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 in 7 ways as a sum of consecutive naturals, for example, 39216683 + ... + 39748869.

It is an arithmetic number, because the mean of its divisors is an integer number (1240913403360).

Almost surely, 2^{21012220111112} is an apocalyptic number.

It is an amenable number.

21012220111112 is a deficient number, since it is larger than the sum of its proper divisors (18697008796408).

21012220111112 is a wasteful number, since it uses less digits than its factorization.

21012220111112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571181 (or 571177 counting only the distinct ones).

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

Adding to 21012220111112 its reverse (21111102221012), we get a palindrome (42123322332124).

The spelling of 21012220111112 in words is "twenty-one trillion, twelve billion, two hundred twenty million, one hundred eleven thousand, one hundred twelve".