243205214231 has 12 divisors (see below), whose sum is σ = 288250156872. Its totient is φ = 204528372048.

The previous prime is 243205214209. The next prime is 243205214237. The reversal of 243205214231 is 132412502342.

It is not a de Polignac number, because 243205214231 - 2²² = 243201019927 is a prime.

It is a super-2 number, since 2×243205214231² (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 = 243205214194 and 243205214203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243205214237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46821665 + ... + 46826858.

It is an arithmetic number, because the mean of its divisors is an integer number (24020846406).

Almost surely, 2^243205214231 is an apocalyptic number.

243205214231 is a deficient number, since it is larger than the sum of its proper divisors (45044942641).

243205214231 is an equidigital number, since it uses as much as digits as its factorization.

243205214231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93648590 (or 93648583 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 243205214231 its reverse (132412502342), we get a palindrome (375617716573).

The spelling of 243205214231 in words is "two hundred forty-three billion, two hundred five million, two hundred fourteen thousand, two hundred thirty-one".