21021203322020 has 24 divisors (see below), whose sum is σ = 48157665792768. Its totient is φ = 7644073935200.

The previous prime is 21021203322019. The next prime is 21021203322029. The reversal of 21021203322020 is 2022330212012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21021203321983 and 21021203322001.

It is not an unprimeable number, because it can be changed into a prime (21021203322029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47775461876 + ... + 47775462315.

It is an arithmetic number, because the mean of its divisors is an integer number (2006569408032).

Almost surely, 2^{21021203322020} is an apocalyptic number.

21021203322020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021203322020 is an abundant number, since it is smaller than the sum of its proper divisors (27136462470748).

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

21021203322020 is a wasteful number, since it uses less digits than its factorization.

21021203322020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95550924211 (or 95550924209 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21021203322020 its reverse (2022330212012), we get a palindrome (23043533534032).

The spelling of 21021203322020 in words is "twenty-one trillion, twenty-one billion, two hundred three million, three hundred twenty-two thousand, twenty".