21002100112020 has 24 divisors (see below), whose sum is σ = 58805880313824. Its totient is φ = 5600560029856.

The previous prime is 21002100112003. The next prime is 21002100112027. The reversal of 21002100112020 is 2021100120012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21002100111987 and 21002100112005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002100112027) 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, 175017500874 + ... + 175017500993.

It is an arithmetic number, because the mean of its divisors is an integer number (2450245013076).

Almost surely, 2^{21002100112020} is an apocalyptic number.

21002100112020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002100112020 is an abundant number, since it is smaller than the sum of its proper divisors (37803780201804).

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

21002100112020 is a wasteful number, since it uses less digits than its factorization.

21002100112020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350035001879 (or 350035001877 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21002100112020 its reverse (2021100120012), we get a palindrome (23023200232032).

The spelling of 21002100112020 in words is "twenty-one trillion, two billion, one hundred million, one hundred twelve thousand, twenty".