21130112 has 16 divisors (see below), whose sum is σ = 42095400. Its totient is φ = 10564992.

The previous prime is 21130111. The next prime is 21130231. The reversal of 21130112 is 21103112.

It is a tau number, because it is divible by the number of its divisors (16).

It is a junction number, because it is equal to n+sod(n) for n = 21130093 and 21130102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82412 + ... + 82667.

Almost surely, 2^21130112 is an apocalyptic number.

It is an amenable number.

21130112 is a deficient number, since it is larger than the sum of its proper divisors (20965288).

21130112 is an equidigital number, since it uses as much as digits as its factorization.

21130112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165093 (or 165081 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 21130112 is about 4596.7501563605. The cubic root of 21130112 is about 276.4610371868.

Adding to 21130112 its reverse (21103112), we get a palindrome (42233224).

Subtracting from 21130112 its reverse (21103112), we obtain a cube (27000 = 30³).

The spelling of 21130112 in words is "twenty-one million, one hundred thirty thousand, one hundred twelve".