243421345020 has 192 divisors, whose sum is σ = 814152923136. Its totient is φ = 53132513280.

The previous prime is 243421344979. The next prime is 243421345049. The reversal of 243421345020 is 20543124342.

It is a super-2 number, since 2×243421345020² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5939800 + ... + 5980640.

It is an arithmetic number, because the mean of its divisors is an integer number (4240379808).

Almost surely, 2^243421345020 is an apocalyptic number.

243421345020 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 243421345020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (407076461568).

243421345020 is an abundant number, since it is smaller than the sum of its proper divisors (570731578116).

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

243421345020 is a wasteful number, since it uses less digits than its factorization.

243421345020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41500 (or 41498 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 30.

Adding to 243421345020 its reverse (20543124342), we get a palindrome (263964469362).

The spelling of 243421345020 in words is "two hundred forty-three billion, four hundred twenty-one million, three hundred forty-five thousand, twenty".