21000202002020 has 48 divisors (see below), whose sum is σ = 46422497217600. Its totient is φ = 7957800190080.

The previous prime is 21000202001939. The next prime is 21000202002083. The reversal of 21000202002020 is 2020020200012.

It is a junction number, because it is equal to n+sod(n) for n = 21000202001992 and 21000202002010.

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 15 ways as a sum of consecutive naturals, for example, 17856746 + ... + 18996414.

It is an arithmetic number, because the mean of its divisors is an integer number (967135358700).

Almost surely, 2^{21000202002020} is an apocalyptic number.

21000202002020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000202002020 is an abundant number, since it is smaller than the sum of its proper divisors (25422295215580).

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

21000202002020 is a wasteful number, since it uses less digits than its factorization.

21000202002020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188188 (or 1188186 counting only the distinct ones).

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

Adding to 21000202002020 its reverse (2020020200012), we get a palindrome (23020222202032).

The spelling of 21000202002020 in words is "twenty-one trillion, two hundred two million, two thousand, twenty".