21352443 has 8 divisors (see below), whose sum is σ = 32537088. Its totient is φ = 12201384.

The previous prime is 21352423. The next prime is 21352451. The reversal of 21352443 is 34425312.

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

It is not a de Polignac number, because 21352443 - 2¹⁷ = 21221371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21352403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 508371 + ... + 508412.

It is an arithmetic number, because the mean of its divisors is an integer number (4067136).

Almost surely, 2^21352443 is an apocalyptic number.

21352443 is a deficient number, since it is larger than the sum of its proper divisors (11184645).

21352443 is a wasteful number, since it uses less digits than its factorization.

21352443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016793.

The product of its digits is 2880, while the sum is 24.

The square root of 21352443 is about 4620.8703725597. The cubic root of 21352443 is about 277.4272969186.

Adding to 21352443 its reverse (34425312), we get a palindrome (55777755).

The spelling of 21352443 in words is "twenty-one million, three hundred fifty-two thousand, four hundred forty-three".