21100021200112 has 40 divisors (see below), whose sum is σ = 41823141897600. Its totient is φ = 10309093808832.

The previous prime is 21100021200073. The next prime is 21100021200157. The reversal of 21100021200112 is 21100212000112.

It is a junction number, because it is equal to n+sod(n) for n = 21100021200092 and 21100021200101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66763662 + ... + 67078957.

It is an arithmetic number, because the mean of its divisors is an integer number (1045578547440).

Almost surely, 2^{21100021200112} is an apocalyptic number.

It is an amenable number.

21100021200112 is a deficient number, since it is larger than the sum of its proper divisors (20723120697488).

21100021200112 is a wasteful number, since it uses less digits than its factorization.

21100021200112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133842853 (or 133842847 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21100021200112 its reverse (21100212000112), we get a palindrome (42200233200224).

The spelling of 21100021200112 in words is "twenty-one trillion, one hundred billion, twenty-one million, two hundred thousand, one hundred twelve".