21143404 has 12 divisors (see below), whose sum is σ = 37110024. Its totient is φ = 10540544.

The previous prime is 21143383. The next prime is 21143411. The reversal of 21143404 is 40434112.

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, 6229 + ... + 9004.

It is an arithmetic number, because the mean of its divisors is an integer number (3092502).

Almost surely, 2^21143404 is an apocalyptic number.

It is an amenable number.

21143404 is a deficient number, since it is larger than the sum of its proper divisors (15966620).

21143404 is a wasteful number, since it uses less digits than its factorization.

21143404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15584 (or 15582 counting only the distinct ones).

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

The square root of 21143404 is about 4598.1957331110. The cubic root of 21143404 is about 276.5189947569.

Adding to 21143404 its reverse (40434112), we get a palindrome (61577516).

The spelling of 21143404 in words is "twenty-one million, one hundred forty-three thousand, four hundred four".