21102112 has 24 divisors (see below), whose sum is σ = 41939856. Its totient is φ = 10450752.

The previous prime is 21102101. The next prime is 21102113. The reversal of 21102112 is 21120112.

It is not an unprimeable number, because it can be changed into a prime (21102113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343 + ... + 6505.

It is an arithmetic number, because the mean of its divisors is an integer number (1747494).

Almost surely, 2^21102112 is an apocalyptic number.

It is an amenable number.

21102112 is a deficient number, since it is larger than the sum of its proper divisors (20837744).

21102112 is a wasteful number, since it uses less digits than its factorization.

21102112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6280 (or 6272 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 21102112 is about 4593.7035167716. The cubic root of 21102112 is about 276.3388682370.

Adding to 21102112 its reverse (21120112), we get a palindrome (42222224).

The spelling of 21102112 in words is "twenty-one million, one hundred two thousand, one hundred twelve".