21100112120 has 32 divisors (see below), whose sum is σ = 47482679520. Its totient is φ = 8438724480.

The previous prime is 21100112107. The next prime is 21100112147. The reversal of 21100112120 is 2121100112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241550 + ... + 317090.

It is an arithmetic number, because the mean of its divisors is an integer number (1483833735).

Almost surely, 2^21100112120 is an apocalyptic number.

21100112120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100112120 is an abundant number, since it is smaller than the sum of its proper divisors (26382567400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21100112120 is a wasteful number, since it uses less digits than its factorization.

21100112120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82535 (or 82531 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21100112120 its reverse (2121100112), we get a palindrome (23221212232).

The spelling of 21100112120 in words is "twenty-one billion, one hundred million, one hundred twelve thousand, one hundred twenty".