21104304100 has 36 divisors (see below), whose sum is σ = 49959646128. Its totient is φ = 7674292000.

The previous prime is 21104304037. The next prime is 21104304103. The reversal of 21104304100 is 140340112.

It is not an unprimeable number, because it can be changed into a prime (21104304103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9591766 + ... + 9593965.

It is an arithmetic number, because the mean of its divisors is an integer number (1387767948).

Almost surely, 2^21104304100 is an apocalyptic number.

21104304100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21104304100 is an abundant number, since it is smaller than the sum of its proper divisors (28855342028).

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

21104304100 is a wasteful number, since it uses less digits than its factorization.

21104304100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19185756 (or 19185749 counting only the distinct ones).

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

Adding to 21104304100 its reverse (140340112), we get a palindrome (21244644212).

The spelling of 21104304100 in words is "twenty-one billion, one hundred four million, three hundred four thousand, one hundred".