21101230020 has 48 divisors (see below), whose sum is σ = 63628326720. Its totient is φ = 5194148736.

The previous prime is 21101230019. The next prime is 21101230063. The reversal of 21101230020 is 2003210112.

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 = 21101229978 and 21101230005.

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, 13525650 + ... + 13527209.

It is an arithmetic number, because the mean of its divisors is an integer number (1325590140).

Almost surely, 2^21101230020 is an apocalyptic number.

21101230020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101230020 is an abundant number, since it is smaller than the sum of its proper divisors (42527096700).

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

21101230020 is a wasteful number, since it uses less digits than its factorization.

21101230020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27052884 (or 27052882 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21101230020 its reverse (2003210112), we get a palindrome (23104440132).

The spelling of 21101230020 in words is "twenty-one billion, one hundred one million, two hundred thirty thousand, twenty".