243121212020 has 24 divisors (see below), whose sum is σ = 515326087584. Its totient is φ = 96339619616.

The previous prime is 243121212011. The next prime is 243121212049. The reversal of 243121212020 is 20212121342.

243121212020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 243121211983 and 243121212001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56801882 + ... + 56806161.

It is an arithmetic number, because the mean of its divisors is an integer number (21471920316).

Almost surely, 2^243121212020 is an apocalyptic number.

243121212020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243121212020 is an abundant number, since it is smaller than the sum of its proper divisors (272204875564).

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

243121212020 is a wasteful number, since it uses less digits than its factorization.

243121212020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113608159 (or 113608157 counting only the distinct ones).

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

Adding to 243121212020 its reverse (20212121342), we get a palindrome (263333333362).

The spelling of 243121212020 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred twelve thousand, twenty".