21343443 has 8 divisors (see below), whose sum is σ = 31045056. Its totient is φ = 12935400.

The previous prime is 21343429. The next prime is 21343451. The reversal of 21343443 is 34434312.

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

It is not a de Polignac number, because 21343443 - 2⁸ = 21343187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21343463) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 323353 + ... + 323418.

It is an arithmetic number, because the mean of its divisors is an integer number (3880632).

Almost surely, 2^21343443 is an apocalyptic number.

21343443 is a deficient number, since it is larger than the sum of its proper divisors (9701613).

21343443 is a wasteful number, since it uses less digits than its factorization.

21343443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646785.

The product of its digits is 3456, while the sum is 24.

The square root of 21343443 is about 4619.8964274105. The cubic root of 21343443 is about 277.3883131427.

Adding to 21343443 its reverse (34434312), we get a palindrome (55777755).

The spelling of 21343443 in words is "twenty-one million, three hundred forty-three thousand, four hundred forty-three".