21404440300 has 72 divisors (see below), whose sum is σ = 47270752256. Its totient is φ = 8411376960.

The previous prime is 21404440273. The next prime is 21404440349. The reversal of 21404440300 is 304440412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1299919 + ... + 1316281.

Almost surely, 2^21404440300 is an apocalyptic number.

21404440300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21404440300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23635376128).

21404440300 is an abundant number, since it is smaller than the sum of its proper divisors (25866311956).

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

21404440300 is a wasteful number, since it uses less digits than its factorization.

21404440300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16607 (or 16600 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21404440300 its reverse (304440412), we get a palindrome (21708880712).

The spelling of 21404440300 in words is "twenty-one billion, four hundred four million, four hundred forty thousand, three hundred".