21025182 has 16 divisors (see below), whose sum is σ = 42523920. Its totient is φ = 6929472.

The previous prime is 21025163. The next prime is 21025187. The reversal of 21025182 is 28152012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21025187) 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 7 ways as a sum of consecutive naturals, for example, 19153 + ... + 20220.

It is an arithmetic number, because the mean of its divisors is an integer number (2657745).

Almost surely, 2^21025182 is an apocalyptic number.

21025182 is an abundant number, since it is smaller than the sum of its proper divisors (21498738).

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

21025182 is a wasteful number, since it uses less digits than its factorization.

21025182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39467.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 21025182 is about 4585.3224532196. The cubic root of 21025182 is about 276.0026517284.

Adding to 21025182 its reverse (28152012), we get a palindrome (49177194).

The spelling of 21025182 in words is "twenty-one million, twenty-five thousand, one hundred eighty-two".