243121041020 has 192 divisors, whose sum is σ = 607911937920. Its totient is φ = 80510976000.

The previous prime is 243121041013. The next prime is 243121041061. The reversal of 243121041020 is 20140121342.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 243121040983 and 243121041001.

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, 90411836 + ... + 90414524.

It is an arithmetic number, because the mean of its divisors is an integer number (3166208010).

Almost surely, 2^243121041020 is an apocalyptic number.

243121041020 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 243121041020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303955968960).

243121041020 is an abundant number, since it is smaller than the sum of its proper divisors (364790896900).

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

243121041020 is a wasteful number, since it uses less digits than its factorization.

243121041020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3136 (or 3134 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 243121041020 its reverse (20140121342), we get a palindrome (263261162362).

The spelling of 243121041020 in words is "two hundred forty-three billion, one hundred twenty-one million, forty-one thousand, twenty".