21100323104 has 96 divisors (see below), whose sum is σ = 49097051136. Its totient is φ = 8735247360.

The previous prime is 21100323103. The next prime is 21100323113. The reversal of 21100323104 is 40132300112.

It is not an unprimeable number, because it can be changed into a prime (21100323103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4254194 + ... + 4259150.

It is an arithmetic number, because the mean of its divisors is an integer number (511427616).

Almost surely, 2^21100323104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21100323104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24548525568).

21100323104 is an abundant number, since it is smaller than the sum of its proper divisors (27996728032).

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

21100323104 is a wasteful number, since it uses less digits than its factorization.

21100323104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5618 (or 5610 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21100323104 its reverse (40132300112), we get a palindrome (61232623216).

The spelling of 21100323104 in words is "twenty-one billion, one hundred million, three hundred twenty-three thousand, one hundred four".