243121112121 has 16 divisors (see below), whose sum is σ = 327890868480. Its totient is φ = 160217016960.

The previous prime is 243121112083. The next prime is 243121112137. The reversal of 243121112121 is 121211121342.

It is not a de Polignac number, because 243121112121 - 2¹⁸ = 243120849977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243121112161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 901651 + ... + 1139831.

It is an arithmetic number, because the mean of its divisors is an integer number (20493179280).

Almost surely, 2^243121112121 is an apocalyptic number.

It is an amenable number.

243121112121 is a deficient number, since it is larger than the sum of its proper divisors (84769756359).

243121112121 is a wasteful number, since it uses less digits than its factorization.

243121112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242096.

The product of its digits is 192, while the sum is 21.

Adding to 243121112121 its reverse (121211121342), we get a palindrome (364332233463).

The spelling of 243121112121 in words is "two hundred forty-three billion, one hundred twenty-one million, one hundred twelve thousand, one hundred twenty-one".