21105182 has 12 divisors (see below), whose sum is σ = 36826560. Its totient is φ = 9045036.

The previous prime is 21105179. The next prime is 21105187. The reversal of 21105182 is 28150112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21105187) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 107582 + ... + 107777.

It is an arithmetic number, because the mean of its divisors is an integer number (3068880).

Almost surely, 2^21105182 is an apocalyptic number.

21105182 is a deficient number, since it is larger than the sum of its proper divisors (15721378).

21105182 is a wasteful number, since it uses less digits than its factorization.

21105182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215375 (or 215368 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 21105182 is about 4594.0376576602. The cubic root of 21105182 is about 276.3522684626.

Adding to 21105182 its reverse (28150112), we get a palindrome (49255294).

The spelling of 21105182 in words is "twenty-one million, one hundred five thousand, one hundred eighty-two".