21403240200 has 192 divisors, whose sum is σ = 74043028800. Its totient is φ = 5682700800.

The previous prime is 21403240171. The next prime is 21403240207. The reversal of 21403240200 is 204230412.

21403240200 is a `hidden beast` number, since 2 + 1 + 403 + 240 + 20 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21403240207) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 1249695 + ... + 1266705.

It is an arithmetic number, because the mean of its divisors is an integer number (385640775).

Almost surely, 2^21403240200 is an apocalyptic number.

21403240200 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 21403240200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37021514400).

21403240200 is an abundant number, since it is smaller than the sum of its proper divisors (52639788600).

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

21403240200 is a wasteful number, since it uses less digits than its factorization.

21403240200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17269 (or 17254 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21403240200 its reverse (204230412), we get a palindrome (21607470612).

The spelling of 21403240200 in words is "twenty-one billion, four hundred three million, two hundred forty thousand, two hundred".