21020121112112 has 20 divisors (see below), whose sum is σ = 40727027580936. Its totient is φ = 10509920446080.

The previous prime is 21020121112091. The next prime is 21020121112157. The reversal of 21020121112112 is 21121112102012.

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 3 ways as a sum of consecutive naturals, for example, 7513814 + ... + 9924597.

Almost surely, 2^{21020121112112} is an apocalyptic number.

It is an amenable number.

21020121112112 is a deficient number, since it is larger than the sum of its proper divisors (19706906468824).

21020121112112 is a wasteful number, since it uses less digits than its factorization.

21020121112112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17513756 (or 17513750 counting only the distinct ones).

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

Adding to 21020121112112 its reverse (21121112102012), we get a palindrome (42141233214124).

The spelling of 21020121112112 in words is "twenty-one trillion, twenty billion, one hundred twenty-one million, one hundred twelve thousand, one hundred twelve".