21042004344100 has 18 divisors (see below), whose sum is σ = 45661149426914. Its totient is φ = 8416801737600.

The previous prime is 21042004344091. The next prime is 21042004344161. The reversal of 21042004344100 is 144340024012.

It can be written as a sum of positive squares in 3 ways, for example, as 2352689687104 + 18689314656996 = 1533848^2 + 4323114^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105210021621 + ... + 105210021820.

Almost surely, 2^{21042004344100} is an apocalyptic number.

21042004344100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21042004344100 is an abundant number, since it is smaller than the sum of its proper divisors (24619145082814).

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

21042004344100 is a wasteful number, since it uses less digits than its factorization.

21042004344100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210420043455 (or 210420043448 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21042004344100 its reverse (144340024012), we get a palindrome (21186344368112).

The spelling of 21042004344100 in words is "twenty-one trillion, forty-two billion, four million, three hundred forty-four thousand, one hundred".