21350443 has 8 divisors (see below), whose sum is σ = 21997440. Its totient is φ = 20707200.

The previous prime is 21350437. The next prime is 21350479. The reversal of 21350443 is 34405312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21350443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21350143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14118 + ... + 15556.

It is an arithmetic number, because the mean of its divisors is an integer number (2749680).

Almost surely, 2^21350443 is an apocalyptic number.

21350443 is a deficient number, since it is larger than the sum of its proper divisors (646997).

21350443 is a wasteful number, since it uses less digits than its factorization.

21350443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1877.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 21350443 is about 4620.6539580453. The cubic root of 21350443 is about 277.4186348041.

Adding to 21350443 its reverse (34405312), we get a palindrome (55755755).

It can be divided in two parts, 21 and 350443, that added together give a square (350464 = 592²).

The spelling of 21350443 in words is "twenty-one million, three hundred fifty thousand, four hundred forty-three".