21001102112020 has 24 divisors (see below), whose sum is σ = 44115444172800. Its totient is φ = 8397939942432.

The previous prime is 21001102111861. The next prime is 21001102112027. The reversal of 21001102112020 is 2021120110012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001102112027) 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, 156237540 + ... + 156371899.

It is an arithmetic number, because the mean of its divisors is an integer number (1838143507200).

Almost surely, 2^{21001102112020} is an apocalyptic number.

21001102112020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001102112020 is an abundant number, since it is smaller than the sum of its proper divisors (23114342060780).

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

21001102112020 is a wasteful number, since it uses less digits than its factorization.

21001102112020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312612807 (or 312612805 counting only the distinct ones).

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

Adding to 21001102112020 its reverse (2021120110012), we get a palindrome (23022222222032).

The spelling of 21001102112020 in words is "twenty-one trillion, one billion, one hundred two million, one hundred twelve thousand, twenty".