21198182 has 4 divisors (see below), whose sum is σ = 31797276. Its totient is φ = 10599090.

The previous prime is 21198179. The next prime is 21198187. The reversal of 21198182 is 28189112.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21198187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5299544 + ... + 5299547.

It is an arithmetic number, because the mean of its divisors is an integer number (7949319).

Almost surely, 2^21198182 is an apocalyptic number.

21198182 is a deficient number, since it is larger than the sum of its proper divisors (10599094).

21198182 is a wasteful number, since it uses less digits than its factorization.

21198182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10599093.

The product of its digits is 2304, while the sum is 32.

The square root of 21198182 is about 4604.1483468715. The cubic root of 21198182 is about 276.7575891870.

It can be divided in two parts, 2119 and 8182, that added together give a palindrome (10301).

The spelling of 21198182 in words is "twenty-one million, one hundred ninety-eight thousand, one hundred eighty-two".