21240442434200 has 48 divisors (see below), whose sum is σ = 53873485815960. Its totient is φ = 7723797248000.

The previous prime is 21240442434187. The next prime is 21240442434209. The reversal of 21240442434200 is 243424404212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240442434209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4827371081 + ... + 4827375480.

Almost surely, 2^{21240442434200} is an apocalyptic number.

21240442434200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21240442434200 is an abundant number, since it is smaller than the sum of its proper divisors (32633043381760).

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

21240442434200 is a wasteful number, since it uses less digits than its factorization.

21240442434200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9654746588 (or 9654746579 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 32.

Adding to 21240442434200 its reverse (243424404212), we get a palindrome (21483866838412).

The spelling of 21240442434200 in words is "twenty-one trillion, two hundred forty billion, four hundred forty-two million, four hundred thirty-four thousand, two hundred".