21112110112 has 12 divisors (see below), whose sum is σ = 41564466846. Its totient is φ = 10556055040.

The previous prime is 21112110109. The next prime is 21112110119. The reversal of 21112110112 is 21101121112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12116725776 + 8995384336 = 110076^2 + 94844^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21112110092 and 21112110101.

It is not an unprimeable number, because it can be changed into a prime (21112110119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329876689 + ... + 329876752.

Almost surely, 2^21112110112 is an apocalyptic number.

It is an amenable number.

21112110112 is a deficient number, since it is larger than the sum of its proper divisors (20452356734).

21112110112 is an equidigital number, since it uses as much as digits as its factorization.

21112110112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659753451 (or 659753443 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21112110112 its reverse (21101121112), we get a palindrome (42213231224).

The spelling of 21112110112 in words is "twenty-one billion, one hundred twelve million, one hundred ten thousand, one hundred twelve".