21100230020 has 24 divisors (see below), whose sum is σ = 44558035200. Its totient is φ = 8392939232.

The previous prime is 21100229963. The next prime is 21100230029. The reversal of 21100230020 is 2003200112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21100229983 and 21100230010.

It is not an unprimeable number, because it can be changed into a prime (21100230029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2943380 + ... + 2950539.

It is an arithmetic number, because the mean of its divisors is an integer number (1856584800).

Almost surely, 2^21100230020 is an apocalyptic number.

21100230020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100230020 is an abundant number, since it is smaller than the sum of its proper divisors (23457805180).

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

21100230020 is a wasteful number, since it uses less digits than its factorization.

21100230020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5894107 (or 5894105 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21100230020 its reverse (2003200112), we get a palindrome (23103430132).

The spelling of 21100230020 in words is "twenty-one billion, one hundred million, two hundred thirty thousand, twenty".