21034002443 has 4 divisors (see below), whose sum is σ = 21035503200. Its totient is φ = 21032501688.

The previous prime is 21034002439. The next prime is 21034002559. The reversal of 21034002443 is 34420043012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21034002443 - 2² = 21034002439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21034002433) 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 3 ways as a sum of consecutive naturals, for example, 729155 + ... + 757452.

It is an arithmetic number, because the mean of its divisors is an integer number (5258875800).

Almost surely, 2^21034002443 is an apocalyptic number.

21034002443 is a deficient number, since it is larger than the sum of its proper divisors (1500757).

21034002443 is a wasteful number, since it uses less digits than its factorization.

21034002443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500756.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21034002443 its reverse (34420043012), we get a palindrome (55454045455).

The spelling of 21034002443 in words is "twenty-one billion, thirty-four million, two thousand, four hundred forty-three".