21013300443 has 64 divisors (see below), whose sum is σ = 30784924800. Its totient is φ = 12716605440.

The previous prime is 21013300433. The next prime is 21013300447. The reversal of 21013300443 is 34400331012.

It is not a de Polignac number, because 21013300443 - 2²⁶ = 20946191579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21013300447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14912923 + ... + 14914331.

It is an arithmetic number, because the mean of its divisors is an integer number (481014450).

Almost surely, 2^21013300443 is an apocalyptic number.

21013300443 is a deficient number, since it is larger than the sum of its proper divisors (9771624357).

21013300443 is a wasteful number, since it uses less digits than its factorization.

21013300443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21013300443 its reverse (34400331012), we get a palindrome (55413631455).

The spelling of 21013300443 in words is "twenty-one billion, thirteen million, three hundred thousand, four hundred forty-three".