21443042 has 8 divisors (see below), whose sum is σ = 32199132. Its totient is φ = 10710000.

The previous prime is 21443033. The next prime is 21443047. The reversal of 21443042 is 24034412.

It can be written as a sum of positive squares in 2 ways, for example, as 21353641 + 89401 = 4621^2 + 299^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21443047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3209 + ... + 7292.

Almost surely, 2^21443042 is an apocalyptic number.

21443042 is a deficient number, since it is larger than the sum of its proper divisors (10756090).

21443042 is a wasteful number, since it uses less digits than its factorization.

21443042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11524.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 21443042 is about 4630.6632354340. The cubic root of 21443042 is about 277.8191204717.

Adding to 21443042 its reverse (24034412), we get a palindrome (45477454).

The spelling of 21443042 in words is "twenty-one million, four hundred forty-three thousand, forty-two".