21243232200 has 96 divisors (see below), whose sum is σ = 65990151360. Its totient is φ = 5653152000.

The previous prime is 21243232183. The next prime is 21243232217. The reversal of 21243232200 is 223234212.

It is an interprime number because it is at equal distance from previous prime (21243232183) and next prime (21243232217).

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, 255850 + ... + 328550.

It is an arithmetic number, because the mean of its divisors is an integer number (687397410).

Almost surely, 2^21243232200 is an apocalyptic number.

21243232200 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 21243232200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32995075680).

21243232200 is an abundant number, since it is smaller than the sum of its proper divisors (44746919160).

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

21243232200 is a wasteful number, since it uses less digits than its factorization.

21243232200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73207 (or 73198 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21243232200 its reverse (223234212), we get a palindrome (21466466412).

The spelling of 21243232200 in words is "twenty-one billion, two hundred forty-three million, two hundred thirty-two thousand, two hundred".