21202002202020 has 96 divisors (see below), whose sum is σ = 60557508240768. Its totient is φ = 5541209490432.

The previous prime is 21202002202009. The next prime is 21202002202099. The reversal of 21202002202020 is 2020220020212.

It is a Harshad number since it is a multiple of its sum of digits (15).

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 31 ways as a sum of consecutive naturals, for example, 12594177 + ... + 14178056.

It is an arithmetic number, because the mean of its divisors is an integer number (630807377508).

Almost surely, 2^{21202002202020} is an apocalyptic number.

21202002202020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202002202020 is an abundant number, since it is smaller than the sum of its proper divisors (39355506038748).

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

21202002202020 is a wasteful number, since it uses less digits than its factorization.

21202002202020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26772509 (or 26772507 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

Adding to 21202002202020 its reverse (2020220020212), we get a palindrome (23222222222232).

The spelling of 21202002202020 in words is "twenty-one trillion, two hundred two billion, two million, two hundred two thousand, twenty".