21001023302020 has 48 divisors (see below), whose sum is σ = 44122336313328. Its totient is φ = 8396565004800.

The previous prime is 21001023301931. The next prime is 21001023302071. The reversal of 21001023302020 is 2020332010012.

It can be written as a sum of positive squares in 8 ways, for example, as 1099717158276 + 19901306143744 = 1048674^2 + 4461088^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21001023301985 and 21001023302003.

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, 453552870 + ... + 453599170.

It is an arithmetic number, because the mean of its divisors is an integer number (919215339861).

Almost surely, 2^{21001023302020} is an apocalyptic number.

21001023302020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001023302020 is an abundant number, since it is smaller than the sum of its proper divisors (23121313011308).

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

21001023302020 is a wasteful number, since it uses less digits than its factorization.

21001023302020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56200 (or 56198 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21001023302020 its reverse (2020332010012), we get a palindrome (23021355312032).

The spelling of 21001023302020 in words is "twenty-one trillion, one billion, twenty-three million, three hundred two thousand, twenty".