21102221002020 has 96 divisors (see below), whose sum is σ = 59541183916032. Its totient is φ = 5584036330368.

The previous prime is 21102221002001. The next prime is 21102221002063. The reversal of 21102221002020 is 2020012220112.

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 (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4610709 + ... + 7966371.

It is an arithmetic number, because the mean of its divisors is an integer number (620220665792).

Almost surely, 2^{21102221002020} is an apocalyptic number.

21102221002020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21102221002020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29770591958016).

21102221002020 is an abundant number, since it is smaller than the sum of its proper divisors (38438962914012).

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

21102221002020 is a wasteful number, since it uses less digits than its factorization.

21102221002020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3356481 (or 3356479 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21102221002020 its reverse (2020012220112), we get a palindrome (23122233222132).

The spelling of 21102221002020 in words is "twenty-one trillion, one hundred two billion, two hundred twenty-one million, two thousand, twenty".