243203131101 has 16 divisors (see below), whose sum is σ = 371173419648. Its totient is φ = 138756403200.

The previous prime is 243203131097. The next prime is 243203131109. The reversal of 243203131101 is 101131302342.

It is not a de Polignac number, because 243203131101 - 2² = 243203131097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243203131109) 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, 9020160 + ... + 9047081.

It is an arithmetic number, because the mean of its divisors is an integer number (23198338728).

Almost surely, 2^243203131101 is an apocalyptic number.

243203131101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

243203131101 is a deficient number, since it is larger than the sum of its proper divisors (127970288547).

243203131101 is a wasteful number, since it uses less digits than its factorization.

243203131101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18067892.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 243203131101 its reverse (101131302342), we get a palindrome (344334433443).

The spelling of 243203131101 in words is "two hundred forty-three billion, two hundred three million, one hundred thirty-one thousand, one hundred one".