21423042242200 has 192 divisors, whose sum is σ = 50597172288000. Its totient is φ = 8434495872000.

The previous prime is 21423042242167. The next prime is 21423042242209. The reversal of 21423042242200 is 224224032412.

It is a happy number.

It is a super-2 number, since 2×21423042242200² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423042242209) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5087398095 + ... + 5087402305.

It is an arithmetic number, because the mean of its divisors is an integer number (263526939000).

Almost surely, 2^{21423042242200} is an apocalyptic number.

21423042242200 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 21423042242200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25298586144000).

21423042242200 is an abundant number, since it is smaller than the sum of its proper divisors (29174130045800).

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

21423042242200 is a wasteful number, since it uses less digits than its factorization.

21423042242200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5546 (or 5537 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 21423042242200 its reverse (224224032412), we get a palindrome (21647266274612).

The spelling of 21423042242200 in words is "twenty-one trillion, four hundred twenty-three billion, forty-two million, two hundred forty-two thousand, two hundred".