21020002002020 has 96 divisors (see below), whose sum is σ = 50959250055168. Its totient is φ = 7133881756032.

The previous prime is 21020002002001. The next prime is 21020002002037. The reversal of 21020002002020 is 2020020002012.

It is a junction number, because it is equal to n+sod(n) for n = 21020002001992 and 21020002002010.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34057007 + ... + 34668713.

It is an arithmetic number, because the mean of its divisors is an integer number (530825521408).

Almost surely, 2^{21020002002020} is an apocalyptic number.

21020002002020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020002002020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25479625027584).

21020002002020 is an abundant number, since it is smaller than the sum of its proper divisors (29939248053148).

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

21020002002020 is a wasteful number, since it uses less digits than its factorization.

21020002002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614209 (or 614207 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 21020002002020 its reverse (2020020002012), we get a palindrome (23040022004032).

The spelling of 21020002002020 in words is "twenty-one trillion, twenty billion, two million, two thousand, twenty".