21161230 has 8 divisors (see below), whose sum is σ = 38090232. Its totient is φ = 8464488.

The previous prime is 21161227. The next prime is 21161237. The reversal of 21161230 is 3216112.

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

It is a super-2 number, since 2×21161230² = 895595310225800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21161237) 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 3 ways as a sum of consecutive naturals, for example, 1058052 + ... + 1058071.

It is an arithmetic number, because the mean of its divisors is an integer number (4761279).

Almost surely, 2^21161230 is an apocalyptic number.

21161230 is a deficient number, since it is larger than the sum of its proper divisors (16929002).

21161230 is a wasteful number, since it uses less digits than its factorization.

21161230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2116130.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 21161230 is about 4600.1336937093. The cubic root of 21161230 is about 276.5966839655.

Adding to 21161230 its reverse (3216112), we get a palindrome (24377342).

The spelling of 21161230 in words is "twenty-one million, one hundred sixty-one thousand, two hundred thirty".