21033033020 has 48 divisors (see below), whose sum is σ = 45508628928. Its totient is φ = 8161896960.

The previous prime is 21033033017. The next prime is 21033033083. The reversal of 21033033020 is 2033033012.

It is a self number, because there is not a number n which added to its sum of digits gives 21033033020.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 29024 + ... + 207143.

It is an arithmetic number, because the mean of its divisors is an integer number (948096436).

Almost surely, 2^21033033020 is an apocalyptic number.

21033033020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21033033020 is an abundant number, since it is smaller than the sum of its proper divisors (24475595908).

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

21033033020 is a wasteful number, since it uses less digits than its factorization.

21033033020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236310 (or 236308 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 17.

Adding to 21033033020 its reverse (2033033012), we get a palindrome (23066066032).

The spelling of 21033033020 in words is "twenty-one billion, thirty-three million, thirty-three thousand, twenty".