21125182 has 16 divisors (see below), whose sum is σ = 34240752. Its totient is φ = 9717120.

The previous prime is 21125177. The next prime is 21125183. The reversal of 21125182 is 28152112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21125183) 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, 7557 + ... + 9967.

It is an arithmetic number, because the mean of its divisors is an integer number (2140047).

Almost surely, 2^21125182 is an apocalyptic number.

21125182 is a deficient number, since it is larger than the sum of its proper divisors (13115570).

21125182 is a wasteful number, since it uses less digits than its factorization.

21125182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2763.

The product of its digits is 320, while the sum is 22.

The square root of 21125182 is about 4596.2138766598. The cubic root of 21125182 is about 276.4395345570.

Adding to 21125182 its reverse (28152112), we get a palindrome (49277294).

The spelling of 21125182 in words is "twenty-one million, one hundred twenty-five thousand, one hundred eighty-two".