21221020111112 has 64 divisors (see below), whose sum is σ = 41131717401600. Its totient is φ = 10258537098240.

The previous prime is 21221020111043. The next prime is 21221020111139. The reversal of 21221020111112 is 21111102012212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 296608208 + ... + 296679744.

It is an arithmetic number, because the mean of its divisors is an integer number (642683084400).

Almost surely, 2^{21221020111112} is an apocalyptic number.

It is an amenable number.

21221020111112 is a deficient number, since it is larger than the sum of its proper divisors (19910697290488).

21221020111112 is a wasteful number, since it uses less digits than its factorization.

21221020111112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81966 (or 81962 counting only the distinct ones).

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

Adding to 21221020111112 its reverse (21111102012212), we get a palindrome (42332122123324).

The spelling of 21221020111112 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, one hundred eleven thousand, one hundred twelve".