21000200002020 has 72 divisors (see below), whose sum is σ = 66059888416704. Its totient is φ = 5600053332576.

The previous prime is 21000200002013. The next prime is 21000200002043. The reversal of 21000200002020 is 2020000200012.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21000200001993 and 21000200002011.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2160509544 + ... + 2160519263.

It is an arithmetic number, because the mean of its divisors is an integer number (917498450232).

Almost surely, 2^{21000200002020} is an apocalyptic number.

21000200002020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000200002020 is an abundant number, since it is smaller than the sum of its proper divisors (45059688414684).

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

21000200002020 is a wasteful number, since it uses less digits than its factorization.

21000200002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4321028831 (or 4321028817 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 21000200002020 its reverse (2020000200012), we get a palindrome (23020200202032).

The spelling of 21000200002020 in words is "twenty-one trillion, two hundred million, two thousand, twenty".