211111321231 has 4 divisors (see below), whose sum is σ = 220290074352. Its totient is φ = 201932568112.

The previous prime is 211111321219. The next prime is 211111321241. The reversal of 211111321231 is 132123111112.

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 211111321231 - 2¹⁹ = 211110796943 is a prime.

It is a super-2 number, since 2×211111321231² (a number of 23 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 = 211111321199 and 211111321208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211111321241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4589376526 + ... + 4589376571.

It is an arithmetic number, because the mean of its divisors is an integer number (55072518588).

Almost surely, 2^211111321231 is an apocalyptic number.

211111321231 is a deficient number, since it is larger than the sum of its proper divisors (9178753121).

211111321231 is an equidigital number, since it uses as much as digits as its factorization.

211111321231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9178753120.

The product of its digits is 72, while the sum is 19.

Adding to 211111321231 its reverse (132123111112), we get a palindrome (343234432343).

The spelling of 211111321231 in words is "two hundred eleven billion, one hundred eleven million, three hundred twenty-one thousand, two hundred thirty-one".