21429881579 has 4 divisors (see below), whose sum is σ = 21430218600. Its totient is φ = 21429544560.

The previous prime is 21429881567. The next prime is 21429881581. The reversal of 21429881579 is 97518892412.

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 21429881579 - 2⁸ = 21429881323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21429881479) 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 3 ways as a sum of consecutive naturals, for example, 40937 + ... + 211034.

It is an arithmetic number, because the mean of its divisors is an integer number (5357554650).

Almost surely, 2^21429881579 is an apocalyptic number.

21429881579 is a deficient number, since it is larger than the sum of its proper divisors (337021).

21429881579 is an equidigital number, since it uses as much as digits as its factorization.

21429881579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337020.

The product of its digits is 2903040, while the sum is 56.

The spelling of 21429881579 in words is "twenty-one billion, four hundred twenty-nine million, eight hundred eighty-one thousand, five hundred seventy-nine".