21243343224200 has 24 divisors (see below), whose sum is σ = 49390772996730. Its totient is φ = 8497337289600.

The previous prime is 21243343224193. The next prime is 21243343224289. The reversal of 21243343224200 is 242234334212.

It can be written as a sum of positive squares in 3 ways, for example, as 19121607226276 + 2121735997924 = 4372826^2 + 1456618^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53108357861 + ... + 53108358260.

Almost surely, 2^{21243343224200} is an apocalyptic number.

21243343224200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21243343224200 is an abundant number, since it is smaller than the sum of its proper divisors (28147429772530).

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

21243343224200 is a wasteful number, since it uses less digits than its factorization.

21243343224200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106216716137 (or 106216716128 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 32.

Adding to 21243343224200 its reverse (242234334212), we get a palindrome (21485577558412).

The spelling of 21243343224200 in words is "twenty-one trillion, two hundred forty-three billion, three hundred forty-three million, two hundred twenty-four thousand, two hundred".