21230100100 has 36 divisors (see below), whose sum is σ = 50257439568. Its totient is φ = 7720036000.

The previous prime is 21230100083. The next prime is 21230100103. The reversal of 21230100100 is 100103212.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21230100103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9648946 + ... + 9651145.

It is an arithmetic number, because the mean of its divisors is an integer number (1396039988).

Almost surely, 2^21230100100 is an apocalyptic number.

21230100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21230100100 is an abundant number, since it is smaller than the sum of its proper divisors (29027339468).

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

21230100100 is a wasteful number, since it uses less digits than its factorization.

21230100100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19300116 (or 19300109 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 21230100100 its reverse (100103212), we get a palindrome (21330203312).

The spelling of 21230100100 in words is "twenty-one billion, two hundred thirty million, one hundred thousand, one hundred".