243121012 has 24 divisors (see below), whose sum is σ = 454635720. Its totient is φ = 113356800.

The previous prime is 243121001. The next prime is 243121037. The reversal of 243121012 is 210121342.

It can be written as a sum of positive squares in 4 ways, for example, as 45887076 + 197233936 = 6774^2 + 14044^2 .

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, 8989 + ... + 23812.

It is an arithmetic number, because the mean of its divisors is an integer number (18943155).

Almost surely, 2^243121012 is an apocalyptic number.

It is an amenable number.

243121012 is a deficient number, since it is larger than the sum of its proper divisors (211514708).

243121012 is a wasteful number, since it uses less digits than its factorization.

243121012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32931 (or 32929 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 243121012 is about 15592.3382467159. The cubic root of 243121012 is about 624.1287161876.

Adding to 243121012 its reverse (210121342), we get a palindrome (453242354).

The spelling of 243121012 in words is "two hundred forty-three million, one hundred twenty-one thousand, twelve".