21033003305 has 8 divisors (see below), whose sum is σ = 25260350472. Its totient is φ = 16812571648.

The previous prime is 21033003301. The next prime is 21033003311. The reversal of 21033003305 is 50330033012.

It can be written as a sum of positive squares in 4 ways, for example, as 2799362281 + 18233641024 = 52909^2 + 135032^2 .

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 21033003305 - 2² = 21033003301 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21033003301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1722182 + ... + 1734351.

It is an arithmetic number, because the mean of its divisors is an integer number (3157543809).

Almost surely, 2^21033003305 is an apocalyptic number.

It is an amenable number.

21033003305 is a deficient number, since it is larger than the sum of its proper divisors (4227347167).

21033003305 is a wasteful number, since it uses less digits than its factorization.

21033003305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3457755.

The product of its (nonzero) digits is 810, while the sum is 20.

Adding to 21033003305 its reverse (50330033012), we get a palindrome (71363036317).

The spelling of 21033003305 in words is "twenty-one billion, thirty-three million, three thousand, three hundred five".