21443104 has 12 divisors (see below), whose sum is σ = 42216174. Its totient is φ = 10721536.

The previous prime is 21443099. The next prime is 21443119. The reversal of 21443104 is 40134412.

It can be written as a sum of positive squares in only one way, i.e., 15586704 + 5856400 = 3948^2 + 2420^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335017 + ... + 335080.

Almost surely, 2^21443104 is an apocalyptic number.

It is an amenable number.

21443104 is a deficient number, since it is larger than the sum of its proper divisors (20773070).

21443104 is an equidigital number, since it uses as much as digits as its factorization.

21443104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670107 (or 670099 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 21443104 is about 4630.6699299345. The cubic root of 21443104 is about 277.8193882317.

Adding to 21443104 its reverse (40134412), we get a palindrome (61577516).

The spelling of 21443104 in words is "twenty-one million, four hundred forty-three thousand, one hundred four".