243124102121 has 4 divisors (see below), whose sum is σ = 243280654932. Its totient is φ = 242967549312.

The previous prime is 243124102093. The next prime is 243124102127. The reversal of 243124102121 is 121201421342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 155188723600 + 87935378521 = 393940^2 + 296539^2 .

It is a cyclic number.

It is not a de Polignac number, because 243124102121 - 2⁶ = 243124102057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243124102127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78274076 + ... + 78277181.

It is an arithmetic number, because the mean of its divisors is an integer number (60820163733).

Almost surely, 2^243124102121 is an apocalyptic number.

It is an amenable number.

243124102121 is a deficient number, since it is larger than the sum of its proper divisors (156552811).

243124102121 is a wasteful number, since it uses less digits than its factorization.

243124102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156552810.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 243124102121 its reverse (121201421342), we get a palindrome (364325523463).

The spelling of 243124102121 in words is "two hundred forty-three billion, one hundred twenty-four million, one hundred two thousand, one hundred twenty-one".