21101120112 has 20 divisors (see below), whose sum is σ = 54511227080. Its totient is φ = 7033706688.

The previous prime is 21101120101. The next prime is 21101120113. The reversal of 21101120112 is 21102110112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101120113) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 219803287 + ... + 219803382.

It is an arithmetic number, because the mean of its divisors is an integer number (2725561354).

Almost surely, 2^21101120112 is an apocalyptic number.

It is an amenable number.

21101120112 is an abundant number, since it is smaller than the sum of its proper divisors (33410106968).

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

21101120112 is a wasteful number, since it uses less digits than its factorization.

21101120112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439606680 (or 439606674 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21101120112 its reverse (21102110112), we get a palindrome (42203230224).

The spelling of 21101120112 in words is "twenty-one billion, one hundred one million, one hundred twenty thousand, one hundred twelve".