11320203231 has 12 divisors (see below), whose sum is σ = 16353636520. Its totient is φ = 7545772080.

The previous prime is 11320203203. The next prime is 11320203233. The reversal of 11320203231 is 13230202311.

11320203231 is a `hidden beast` number, since 1 + 1 + 320 + 20 + 323 + 1 = 666.

It is not a de Polignac number, because 11320203231 - 2²² = 11316008927 is a prime.

It is a super-2 number, since 2×11320203231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11320203233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12985 + ... + 151026.

Almost surely, 2^11320203231 is an apocalyptic number.

11320203231 is a deficient number, since it is larger than the sum of its proper divisors (5033433289).

11320203231 is a wasteful number, since it uses less digits than its factorization.

11320203231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171686 (or 171683 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 11320203231 its reverse (13230202311), we get a palindrome (24550405542).

The spelling of 11320203231 in words is "eleven billion, three hundred twenty million, two hundred three thousand, two hundred thirty-one".