21182830 has 8 divisors (see below), whose sum is σ = 38129112. Its totient is φ = 8473128.

The previous prime is 21182813. The next prime is 21182849. The reversal of 21182830 is 3828112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21182795 and 21182804.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 1059132 + ... + 1059151.

It is an arithmetic number, because the mean of its divisors is an integer number (4766139).

Almost surely, 2^21182830 is an apocalyptic number.

21182830 is a deficient number, since it is larger than the sum of its proper divisors (16946282).

21182830 is a wasteful number, since it uses less digits than its factorization.

21182830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2118290.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 21182830 is about 4602.4808527576. The cubic root of 21182830 is about 276.6907625664.

The spelling of 21182830 in words is "twenty-one million, one hundred eighty-two thousand, eight hundred thirty".