21020110112 has 12 divisors (see below), whose sum is σ = 41383341846. Its totient is φ = 10510055040.

The previous prime is 21020110091. The next prime is 21020110121. The reversal of 21020110112 is 21101102012.

It can be written as a sum of positive squares in only one way, i.e., 20965881616 + 54228496 = 144796^2 + 7364^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21020110093 and 21020110102.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328439189 + ... + 328439252.

Almost surely, 2^21020110112 is an apocalyptic number.

It is an amenable number.

21020110112 is a deficient number, since it is larger than the sum of its proper divisors (20363231734).

21020110112 is an equidigital number, since it uses as much as digits as its factorization.

21020110112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656878451 (or 656878443 counting only the distinct ones).

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

Adding to 21020110112 its reverse (21101102012), we get a palindrome (42121212124).

The spelling of 21020110112 in words is "twenty-one billion, twenty million, one hundred ten thousand, one hundred twelve".