11013231231 has 16 divisors (see below), whose sum is σ = 17174630400. Its totient is φ = 6955724664.

The previous prime is 11013231223. The next prime is 11013231241. The reversal of 11013231231 is 13213231011.

11013231231 is a `hidden beast` number, since 110 + 1 + 323 + 1 + 231 = 666.

It is not a de Polignac number, because 11013231231 - 2³ = 11013231223 is a prime.

It is a super-2 number, since 2×11013231231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11013231211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10733631 + ... + 10734656.

It is an arithmetic number, because the mean of its divisors is an integer number (1073414400).

Almost surely, 2^11013231231 is an apocalyptic number.

11013231231 is a deficient number, since it is larger than the sum of its proper divisors (6161399169).

11013231231 is a wasteful number, since it uses less digits than its factorization.

11013231231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21468315 (or 21468309 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 11013231231 its reverse (13213231011), we get a palindrome (24226462242).

The spelling of 11013231231 in words is "eleven billion, thirteen million, two hundred thirty-one thousand, two hundred thirty-one".