21312003200 has 192 divisors, whose sum is σ = 53990517600. Its totient is φ = 8310128640.

The previous prime is 21312003173. The next prime is 21312003221. The reversal of 21312003200 is 230021312.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22940336 + ... + 22941264.

Almost surely, 2^21312003200 is an apocalyptic number.

21312003200 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 21312003200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26995258800).

21312003200 is an abundant number, since it is smaller than the sum of its proper divisors (32678514400).

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

21312003200 is a wasteful number, since it uses less digits than its factorization.

21312003200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127 (or 1110 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21312003200 its reverse (230021312), we get a palindrome (21542024512).

The spelling of 21312003200 in words is "twenty-one billion, three hundred twelve million, three thousand, two hundred".