21021010112020 has 96 divisors (see below), whose sum is σ = 44708368320000. Its totient is φ = 8301508300800.

The previous prime is 21021010111999. The next prime is 21021010112057. The reversal of 21021010112020 is 2021101012012.

It is a super-2 number, since 2×21021010112020² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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, 1501600981 + ... + 1501614979.

It is an arithmetic number, because the mean of its divisors is an integer number (465712170000).

Almost surely, 2^{21021010112020} is an apocalyptic number.

21021010112020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021010112020 is an abundant number, since it is smaller than the sum of its proper divisors (23687358207980).

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

21021010112020 is a wasteful number, since it uses less digits than its factorization.

21021010112020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16529 (or 16527 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21021010112020 its reverse (2021101012012), we get a palindrome (23042111124032).

The spelling of 21021010112020 in words is "twenty-one trillion, twenty-one billion, ten million, one hundred twelve thousand, twenty".