21021202002020 has 24 divisors (see below), whose sum is σ = 48157662768768. Its totient is φ = 7644073455200.

The previous prime is 21021202001999. The next prime is 21021202002049. The reversal of 21021202002020 is 2020020212012.

It is a junction number, because it is equal to n+sod(n) for n = 21021202001986 and 21021202002004.

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 7 ways as a sum of consecutive naturals, for example, 47775458876 + ... + 47775459315.

It is an arithmetic number, because the mean of its divisors is an integer number (2006569282032).

Almost surely, 2^{21021202002020} is an apocalyptic number.

21021202002020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021202002020 is an abundant number, since it is smaller than the sum of its proper divisors (27136460766748).

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

21021202002020 is a wasteful number, since it uses less digits than its factorization.

21021202002020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95550918211 (or 95550918209 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21021202002020 its reverse (2020020212012), we get a palindrome (23041222214032).

The spelling of 21021202002020 in words is "twenty-one trillion, twenty-one billion, two hundred two million, two thousand, twenty".