21043434329 has 8 divisors (see below), whose sum is σ = 21416879808. Its totient is φ = 20672129520.

The previous prime is 21043434281. The next prime is 21043434337. The reversal of 21043434329 is 92343434012.

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

It is a cyclic number.

It is not a de Polignac number, because 21043434329 - 2⁸ = 21043434073 is a prime.

It is a super-2 number, since 2×21043434329² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21043434829) 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 7 ways as a sum of consecutive naturals, for example, 515327 + ... + 554660.

It is an arithmetic number, because the mean of its divisors is an integer number (2677109976).

Almost surely, 2^21043434329 is an apocalyptic number.

It is an amenable number.

21043434329 is a deficient number, since it is larger than the sum of its proper divisors (373445479).

21043434329 is a wasteful number, since it uses less digits than its factorization.

21043434329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070335.

The product of its (nonzero) digits is 62208, while the sum is 35.

The spelling of 21043434329 in words is "twenty-one billion, forty-three million, four hundred thirty-four thousand, three hundred twenty-nine".