21112122120112 has 20 divisors (see below), whose sum is σ = 40905784538320. Its totient is φ = 10555790626368.

The previous prime is 21112122120101. The next prime is 21112122120149. The reversal of 21112122120112 is 21102122121112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21112122120112.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16257303 + ... + 17507830.

It is an arithmetic number, because the mean of its divisors is an integer number (2045289226916).

Almost surely, 2^{21112122120112} is an apocalyptic number.

It is an amenable number.

21112122120112 is a deficient number, since it is larger than the sum of its proper divisors (19793662418208).

21112122120112 is a wasteful number, since it uses less digits than its factorization.

21112122120112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33804220 (or 33804214 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21112122120112 its reverse (21102122121112), we get a palindrome (42214244241224).

It can be divided in two parts, 2111212 and 2120112, that added together give a palindrome (4231324).

The spelling of 21112122120112 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty-two million, one hundred twenty thousand, one hundred twelve".