23131203211 has 4 divisors (see below), whose sum is σ = 23133063712. Its totient is φ = 23129342712.

The previous prime is 23131203143. The next prime is 23131203223. The reversal of 23131203211 is 11230213132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23131203211 - 2³¹ = 20983719563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23131213211) 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 3 ways as a sum of consecutive naturals, for example, 911475 + ... + 936508.

It is an arithmetic number, because the mean of its divisors is an integer number (5783265928).

Almost surely, 2^23131203211 is an apocalyptic number.

23131203211 is a deficient number, since it is larger than the sum of its proper divisors (1860501).

23131203211 is a wasteful number, since it uses less digits than its factorization.

23131203211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860500.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 23131203211 its reverse (11230213132), we get a palindrome (34361416343).

The spelling of 23131203211 in words is "twenty-three billion, one hundred thirty-one million, two hundred three thousand, two hundred eleven".