21107112 has 32 divisors (see below), whose sum is σ = 56827680. Its totient is φ = 6494400.

The previous prime is 21107101. The next prime is 21107117. The reversal of 21107112 is 21170112.

It is a junction number, because it is equal to n+sod(n) for n = 21107091 and 21107100.

It is not an unprimeable number, because it can be changed into a prime (21107117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33514 + ... + 34137.

It is an arithmetic number, because the mean of its divisors is an integer number (1775865).

Almost surely, 2^21107112 is an apocalyptic number.

It is an amenable number.

21107112 is an abundant number, since it is smaller than the sum of its proper divisors (35720568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21107112 is a wasteful number, since it uses less digits than its factorization.

21107112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67673 (or 67669 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 15.

The square root of 21107112 is about 4594.2477077319. The cubic root of 21107112 is about 276.3606920435.

Adding to 21107112 its reverse (21170112), we get a palindrome (42277224).

The spelling of 21107112 in words is "twenty-one million, one hundred seven thousand, one hundred twelve".