21252182 has 12 divisors (see below), whose sum is σ = 37083060. Its totient is φ = 9108036.

The previous prime is 21252167. The next prime is 21252211. The reversal of 21252182 is 28125212.

It is a super-2 number, since 2×21252182² = 903310479522248, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 108332 + ... + 108527.

It is an arithmetic number, because the mean of its divisors is an integer number (3090255).

Almost surely, 2^21252182 is an apocalyptic number.

21252182 is a deficient number, since it is larger than the sum of its proper divisors (15830878).

21252182 is a wasteful number, since it uses less digits than its factorization.

21252182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216875 (or 216868 counting only the distinct ones).

The product of its digits is 640, while the sum is 23.

The square root of 21252182 is about 4610.0088937007. The cubic root of 21252182 is about 276.9923929323.

Adding to 21252182 its reverse (28125212), we get a palindrome (49377394).

The spelling of 21252182 in words is "twenty-one million, two hundred fifty-two thousand, one hundred eighty-two".