21020021333020 has 24 divisors (see below), whose sum is σ = 44204304412800. Its totient is φ = 8396149559232.

The previous prime is 21020021333011. The next prime is 21020021333033. The reversal of 21020021333020 is 2033312002012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 741171340 + ... + 741199699.

It is an arithmetic number, because the mean of its divisors is an integer number (1841846017200).

Almost surely, 2^{21020021333020} is an apocalyptic number.

21020021333020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020021333020 is an abundant number, since it is smaller than the sum of its proper divisors (23184283079780).

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

21020021333020 is a wasteful number, since it uses less digits than its factorization.

21020021333020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1482371757 (or 1482371755 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21020021333020 its reverse (2033312002012), we get a palindrome (23053333335032).

The spelling of 21020021333020 in words is "twenty-one trillion, twenty billion, twenty-one million, three hundred thirty-three thousand, twenty".