21033033018 has 8 divisors (see below), whose sum is σ = 42066066048. Its totient is φ = 7011011004.

The previous prime is 21033033017. The next prime is 21033033083. The reversal of 21033033018 is 81033033012.

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

21033033018 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21033033013) 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, 1752752746 + ... + 1752752757.

It is an arithmetic number, because the mean of its divisors is an integer number (5258258256).

Almost surely, 2^21033033018 is an apocalyptic number.

21033033018 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21033033018 is a wasteful number, since it uses less digits than its factorization.

21033033018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3505505508.

The product of its (nonzero) digits is 1296, while the sum is 24.

The spelling of 21033033018 in words is "twenty-one billion, thirty-three million, thirty-three thousand, eighteen".