211123331231 has 4 divisors (see below), whose sum is σ = 211125063864. Its totient is φ = 211121598600.

The previous prime is 211123331213. The next prime is 211123331311. The reversal of 211123331231 is 132133321112.

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 211123331231 - 2²⁶ = 211056222367 is a prime.

It is a super-2 number, since 2×211123331231² (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 = 211123331197 and 211123331206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211123331131) 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, 668480 + ... + 932261.

It is an arithmetic number, because the mean of its divisors is an integer number (52781265966).

Almost surely, 2^211123331231 is an apocalyptic number.

211123331231 is a deficient number, since it is larger than the sum of its proper divisors (1732633).

211123331231 is a wasteful number, since it uses less digits than its factorization.

211123331231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1732632.

The product of its digits is 648, while the sum is 23.

Adding to 211123331231 its reverse (132133321112), we get a palindrome (343256652343).

The spelling of 211123331231 in words is "two hundred eleven billion, one hundred twenty-three million, three hundred thirty-one thousand, two hundred thirty-one".