21104340100 has 36 divisors (see below), whose sum is σ = 45878758884. Its totient is φ = 8426558080.

The previous prime is 21104340071. The next prime is 21104340119. The reversal of 21104340100 is 104340112.

It can be written as a sum of positive squares in 6 ways, for example, as 3686675524 + 17417664576 = 60718^2 + 131976^2 .

It is an unprimeable number.

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, 133747 + ... + 245146.

It is an arithmetic number, because the mean of its divisors is an integer number (1274409969).

Almost surely, 2^21104340100 is an apocalyptic number.

21104340100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21104340100 is an abundant number, since it is smaller than the sum of its proper divisors (24774418784).

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

21104340100 is a wasteful number, since it uses less digits than its factorization.

21104340100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379464 (or 379457 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21104340100 its reverse (104340112), we get a palindrome (21208680212).

The spelling of 21104340100 in words is "twenty-one billion, one hundred four million, three hundred forty thousand, one hundred".