243140121 has 24 divisors (see below), whose sum is σ = 408183360. Its totient is φ = 136580256.

The previous prime is 243140101. The next prime is 243140123. The reversal of 243140121 is 121041342.

243140121 is a `hidden beast` number, since 243 + 1 + 401 + 21 = 666.

243140121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 243140121 - 2⁶ = 243140057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243140094 and 243140103.

It is not an unprimeable number, because it can be changed into a prime (243140123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28990 + ... + 36423.

It is an arithmetic number, because the mean of its divisors is an integer number (17007640).

Almost surely, 2^243140121 is an apocalyptic number.

243140121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

243140121 is a deficient number, since it is larger than the sum of its proper divisors (165043239).

243140121 is a wasteful number, since it uses less digits than its factorization.

243140121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65485 (or 65482 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 243140121 is about 15592.9510035785. The cubic root of 243140121 is about 624.1450676650.

Adding to 243140121 its reverse (121041342), we get a palindrome (364181463).

The spelling of 243140121 in words is "two hundred forty-three million, one hundred forty thousand, one hundred twenty-one".