243121225331 has 4 divisors (see below), whose sum is σ = 243228471192. Its totient is φ = 243013979472.

The previous prime is 243121225289. The next prime is 243121225349. The reversal of 243121225331 is 133522121342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133522121342 = 2 ⋅66761060671.

It is a cyclic number.

It is not a de Polignac number, because 243121225331 - 2¹⁸ = 243120963187 is a prime.

It is a super-2 number, since 2×243121225331² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243121225294 and 243121225303.

It is not an unprimeable number, because it can be changed into a prime (243121228331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53619530 + ... + 53624063.

It is an arithmetic number, because the mean of its divisors is an integer number (60807117798).

Almost surely, 2^243121225331 is an apocalyptic number.

243121225331 is a deficient number, since it is larger than the sum of its proper divisors (107245861).

243121225331 is a wasteful number, since it uses less digits than its factorization.

243121225331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107245860.

The product of its digits is 8640, while the sum is 29.

Adding to 243121225331 its reverse (133522121342), we get a palindrome (376643346673).

The spelling of 243121225331 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred twenty-five thousand, three hundred thirty-one".