21324102400 has 54 divisors (see below), whose sum is σ = 52780501172. Its totient is φ = 8529638400.

The previous prime is 21324102341. The next prime is 21324102407. The reversal of 21324102400 is 420142312.

It is not an unprimeable number, because it can be changed into a prime (21324102407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1659546 + ... + 1672345.

Almost surely, 2^21324102400 is an apocalyptic number.

21324102400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21324102400 is an abundant number, since it is smaller than the sum of its proper divisors (31456398772).

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

21324102400 is an equidigital number, since it uses as much as digits as its factorization.

21324102400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3331917 (or 3331898 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21324102400 its reverse (420142312), we get a palindrome (21744244712).

The spelling of 21324102400 in words is "twenty-one billion, three hundred twenty-four million, one hundred two thousand, four hundred".