21617112 has 32 divisors (see below), whose sum is σ = 58956480. Its totient is φ = 6550560.

The previous prime is 21617111. The next prime is 21617143. The reversal of 21617112 is 21171612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21617111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40678 + ... + 41205.

It is an arithmetic number, because the mean of its divisors is an integer number (1842390).

Almost surely, 2^21617112 is an apocalyptic number.

21617112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21617112 is an abundant number, since it is smaller than the sum of its proper divisors (37339368).

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

21617112 is a wasteful number, since it uses less digits than its factorization.

21617112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81903 (or 81899 counting only the distinct ones).

The product of its digits is 168, while the sum is 21.

The square root of 21617112 is about 4649.4206090652. The cubic root of 21617112 is about 278.5688540008.

Adding to 21617112 its reverse (21171612), we get a palindrome (42788724).

The spelling of 21617112 in words is "twenty-one million, six hundred seventeen thousand, one hundred twelve".