243421022440 has 128 divisors (see below), whose sum is σ = 607659408000. Its totient is φ = 87382084608.

The previous prime is 243421022393. The next prime is 243421022443. The reversal of 243421022440 is 44220124342.

It is a junction number, because it is equal to n+sod(n) for n = 243421022399 and 243421022408.

It is not an unprimeable number, because it can be changed into a prime (243421022443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1063927 + ... + 1272313.

It is an arithmetic number, because the mean of its divisors is an integer number (4747339125).

Almost surely, 2^243421022440 is an apocalyptic number.

243421022440 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 243421022440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303829704000).

243421022440 is an abundant number, since it is smaller than the sum of its proper divisors (364238385560).

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

243421022440 is a wasteful number, since it uses less digits than its factorization.

243421022440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208499 (or 208495 counting only the distinct ones).

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

Adding to 243421022440 its reverse (44220124342), we get a palindrome (287641146782).

The spelling of 243421022440 in words is "two hundred forty-three billion, four hundred twenty-one million, twenty-two thousand, four hundred forty".