21170112 has 28 divisors (see below), whose sum is σ = 56013096. Its totient is φ = 7056640.

The previous prime is 21170101. The next prime is 21170113. The reversal of 21170112 is 21107112.

It is a junction number, because it is equal to n+sod(n) for n = 21170091 and 21170100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21170113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54939 + ... + 55322.

Almost surely, 2^21170112 is an apocalyptic number.

It is an amenable number.

21170112 is an abundant number, since it is smaller than the sum of its proper divisors (34842984).

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

21170112 is a wasteful number, since it uses less digits than its factorization.

21170112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110276 (or 110266 counting only the distinct ones).

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

The square root of 21170112 is about 4601.0989991523. The cubic root of 21170112 is about 276.6353771811.

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

The spelling of 21170112 in words is "twenty-one million, one hundred seventy thousand, one hundred twelve".