21034035305 has 32 divisors (see below), whose sum is σ = 25876730880. Its totient is φ = 16410363840.

The previous prime is 21034035301. The next prime is 21034035313. The reversal of 21034035305 is 50353043012.

It is not a de Polignac number, because 21034035305 - 2² = 21034035301 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21034035301) 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 31 ways as a sum of consecutive naturals, for example, 9376514 + ... + 9378756.

It is an arithmetic number, because the mean of its divisors is an integer number (808647840).

Almost surely, 2^21034035305 is an apocalyptic number.

It is an amenable number.

21034035305 is a deficient number, since it is larger than the sum of its proper divisors (4842695575).

21034035305 is a wasteful number, since it uses less digits than its factorization.

21034035305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2621.

The product of its (nonzero) digits is 5400, while the sum is 26.

Adding to 21034035305 its reverse (50353043012), we get a palindrome (71387078317).

The spelling of 21034035305 in words is "twenty-one billion, thirty-four million, thirty-five thousand, three hundred five".