21165233182 has 16 divisors (see below), whose sum is σ = 31936867200. Its totient is φ = 10519732440.

The previous prime is 21165233107. The next prime is 21165233191. The reversal of 21165233182 is 28133256112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324169 + ... + 383947.

It is an arithmetic number, because the mean of its divisors is an integer number (1996054200).

Almost surely, 2^21165233182 is an apocalyptic number.

21165233182 is a deficient number, since it is larger than the sum of its proper divisors (10771634018).

21165233182 is a wasteful number, since it uses less digits than its factorization.

21165233182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60831.

The product of its digits is 17280, while the sum is 34.

Adding to 21165233182 its reverse (28133256112), we get a palindrome (49298489294).

The spelling of 21165233182 in words is "twenty-one billion, one hundred sixty-five million, two hundred thirty-three thousand, one hundred eighty-two".