21343443465 has 8 divisors (see below), whose sum is σ = 34149509568. Its totient is φ = 11383169840.

The previous prime is 21343443427. The next prime is 21343443521. The reversal of 21343443465 is 56434434312.

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

It is not a de Polignac number, because 21343443465 - 2¹⁰ = 21343442441 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 711448101 + ... + 711448130.

It is an arithmetic number, because the mean of its divisors is an integer number (4268688696).

Almost surely, 2^21343443465 is an apocalyptic number.

It is an amenable number.

21343443465 is a deficient number, since it is larger than the sum of its proper divisors (12806066103).

21343443465 is a wasteful number, since it uses less digits than its factorization.

21343443465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422896239.

The product of its digits is 414720, while the sum is 39.

Adding to 21343443465 its reverse (56434434312), we get a palindrome (77777877777).

The spelling of 21343443465 in words is "twenty-one billion, three hundred forty-three million, four hundred forty-three thousand, four hundred sixty-five".