21102001120020 has 48 divisors (see below), whose sum is σ = 59749486332480. Its totient is φ = 5563973327616.

The previous prime is 21102001119973. The next prime is 21102001120063. The reversal of 21102001120020 is 2002110020112.

21102001120020 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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 = 21102001119978 and 21102001120005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1975837462 + ... + 1975848141.

It is an arithmetic number, because the mean of its divisors is an integer number (1244780965260).

Almost surely, 2^{21102001120020} is an apocalyptic number.

21102001120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102001120020 is an abundant number, since it is smaller than the sum of its proper divisors (38647485212460).

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

21102001120020 is a wasteful number, since it uses less digits than its factorization.

21102001120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3951685704 (or 3951685702 counting only the distinct ones).

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

Adding to 21102001120020 its reverse (2002110020112), we get a palindrome (23104111140132).

The spelling of 21102001120020 in words is "twenty-one trillion, one hundred two billion, one million, one hundred twenty thousand, twenty".