11121131231 has 8 divisors (see below), whose sum is σ = 12710888064. Its totient is φ = 9531630360.

The previous prime is 11121131201. The next prime is 11121131249. The reversal of 11121131231 is 13213112111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11121131231 - 2²² = 11116936927 is a prime.

It is a super-2 number, since 2×11121131231² (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 (11121131201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40496 + ... + 154538.

It is an arithmetic number, because the mean of its divisors is an integer number (1588861008).

Almost surely, 2^11121131231 is an apocalyptic number.

11121131231 is a deficient number, since it is larger than the sum of its proper divisors (1589756833).

11121131231 is a wasteful number, since it uses less digits than its factorization.

11121131231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127981.

The product of its digits is 36, while the sum is 17.

Adding to 11121131231 its reverse (13213112111), we get a palindrome (24334243342).

The spelling of 11121131231 in words is "eleven billion, one hundred twenty-one million, one hundred thirty-one thousand, two hundred thirty-one".