21100121112 has 64 divisors (see below), whose sum is σ = 60309446400. Its totient is φ = 6026267520.

The previous prime is 21100121093. The next prime is 21100121117. The reversal of 21100121112 is 21112100112.

It is a super-2 number, since 2×21100121112² (a number of 21 digits) contains 22 as substring.

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 (21100121117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 435814 + ... + 481802.

It is an arithmetic number, because the mean of its divisors is an integer number (942335100).

Almost surely, 2^21100121112 is an apocalyptic number.

It is an amenable number.

21100121112 is an abundant number, since it is smaller than the sum of its proper divisors (39209325288).

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

21100121112 is a wasteful number, since it uses less digits than its factorization.

21100121112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48736 (or 48732 counting only the distinct ones).

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

Adding to 21100121112 its reverse (21112100112), we get a palindrome (42212221224).

The spelling of 21100121112 in words is "twenty-one billion, one hundred million, one hundred twenty-one thousand, one hundred twelve".