11231618211 has 48 divisors (see below), whose sum is σ = 18019802112. Its totient is φ = 6740213040.

The previous prime is 11231618147. The next prime is 11231618239. The reversal of 11231618211 is 11281613211.

11231618211 is a `hidden beast` number, since 1 + 1 + 2 + 31 + 618 + 2 + 11 = 666.

It is not a de Polignac number, because 11231618211 - 2⁶ = 11231618147 is a prime.

It is a super-2 number, since 2×11231618211² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11231618611) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1229286 + ... + 1238388.

It is an arithmetic number, because the mean of its divisors is an integer number (375412544).

Almost surely, 2^11231618211 is an apocalyptic number.

11231618211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11231618211 is a deficient number, since it is larger than the sum of its proper divisors (6788183901).

11231618211 is a wasteful number, since it uses less digits than its factorization.

11231618211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9245 (or 9220 counting only the distinct ones).

The product of its digits is 576, while the sum is 27.

Subtracting 11231618211 from its reverse (11281613211), we obtain a triangular number (49995000 = T₉₉₉₉).

The spelling of 11231618211 in words is "eleven billion, two hundred thirty-one million, six hundred eighteen thousand, two hundred eleven".