21104224400 has 60 divisors (see below), whose sum is σ = 57946178112. Its totient is φ = 7235733120.

The previous prime is 21104224363. The next prime is 21104224441. The reversal of 21104224400 is 442240112.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3765812 + ... + 3771411.

Almost surely, 2^21104224400 is an apocalyptic number.

21104224400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21104224400 is an abundant number, since it is smaller than the sum of its proper divisors (36841953712).

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

21104224400 is a wasteful number, since it uses less digits than its factorization.

21104224400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7537248 (or 7537237 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21104224400 its reverse (442240112), we get a palindrome (21546464512).

The spelling of 21104224400 in words is "twenty-one billion, one hundred four million, two hundred twenty-four thousand, four hundred".