21324033400 has 24 divisors (see below), whose sum is σ = 49578378120. Its totient is φ = 8529613280.

The previous prime is 21324033389. The next prime is 21324033421. The reversal of 21324033400 is 433042312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53309884 + ... + 53310283.

It is an arithmetic number, because the mean of its divisors is an integer number (2065765755).

Almost surely, 2^21324033400 is an apocalyptic number.

21324033400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21324033400 is an abundant number, since it is smaller than the sum of its proper divisors (28254344720).

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

21324033400 is a wasteful number, since it uses less digits than its factorization.

21324033400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106620183 (or 106620174 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21324033400 its reverse (433042312), we get a palindrome (21757075712).

The spelling of 21324033400 in words is "twenty-one billion, three hundred twenty-four million, thirty-three thousand, four hundred".