21843130 has 16 divisors (see below), whose sum is σ = 41630760. Its totient is φ = 8223232.

The previous prime is 21843121. The next prime is 21843131. The reversal of 21843130 is 3134812.

It can be written as a sum of positive squares in 4 ways, for example, as 15202201 + 6640929 = 3899^2 + 2577^2 .

It is not an unprimeable number, because it can be changed into a prime (21843131) 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 in 7 ways as a sum of consecutive naturals, for example, 64075 + ... + 64414.

Almost surely, 2^21843130 is an apocalyptic number.

21843130 is a deficient number, since it is larger than the sum of its proper divisors (19787630).

21843130 is a wasteful number, since it uses less digits than its factorization.

21843130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128513.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21843130 is about 4673.6634453071. The cubic root of 21843130 is about 279.5363500160.

Adding to 21843130 its reverse (3134812), we get a palindrome (24977942).

The spelling of 21843130 in words is "twenty-one million, eight hundred forty-three thousand, one hundred thirty".