243120400001 has 16 divisors (see below), whose sum is σ = 252325784400. Its totient is φ = 233971089408.

The previous prime is 243120399971. The next prime is 243120400009. The reversal of 243120400001 is 100004021342.

It can be written as a sum of positive squares in 8 ways, for example, as 16307290000 + 226813110001 = 127700^2 + 476249^2 .

It is a cyclic number.

It is not a de Polignac number, because 243120400001 - 2¹⁴ = 243120383617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243120400009) 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, 11250515 + ... + 11272103.

It is an arithmetic number, because the mean of its divisors is an integer number (15770361525).

Almost surely, 2^243120400001 is an apocalyptic number.

It is an amenable number.

243120400001 is a deficient number, since it is larger than the sum of its proper divisors (9205384399).

243120400001 is a wasteful number, since it uses less digits than its factorization.

243120400001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22868.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 243120400001 its reverse (100004021342), we get a palindrome (343124421343).

The spelling of 243120400001 in words is "two hundred forty-three billion, one hundred twenty million, four hundred thousand, one".