243312121031 has 16 divisors (see below), whose sum is σ = 287678088000. Its totient is φ = 201348849408.

The previous prime is 243312120979. The next prime is 243312121051. The reversal of 243312121031 is 130121213342.

It is not a de Polignac number, because 243312121031 - 2²² = 243307926727 is a prime.

It is a super-2 number, since 2×243312121031² (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 = 243312120988 and 243312121006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243312121051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4392395 + ... + 4447443.

It is an arithmetic number, because the mean of its divisors is an integer number (17979880500).

Almost surely, 2^243312121031 is an apocalyptic number.

243312121031 is a deficient number, since it is larger than the sum of its proper divisors (44365966969).

243312121031 is a wasteful number, since it uses less digits than its factorization.

243312121031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76858.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 243312121031 its reverse (130121213342), we get a palindrome (373433334373).

The spelling of 243312121031 in words is "two hundred forty-three billion, three hundred twelve million, one hundred twenty-one thousand, thirty-one".