11111321131 has 4 divisors (see below), whose sum is σ = 11369723992. Its totient is φ = 10852918272.

The previous prime is 11111321129. The next prime is 11111321171. The reversal of 11111321131 is 13112311111.

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 11111321131 - 2¹ = 11111321129 is a prime.

It is a super-2 number, since 2×11111321131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111321171) 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, 129201366 + ... + 129201451.

It is an arithmetic number, because the mean of its divisors is an integer number (2842430998).

Almost surely, 2^11111321131 is an apocalyptic number.

11111321131 is a deficient number, since it is larger than the sum of its proper divisors (258402861).

11111321131 is an equidigital number, since it uses as much as digits as its factorization.

11111321131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258402860.

The product of its digits is 18, while the sum is 16.

Adding to 11111321131 its reverse (13112311111), we get a palindrome (24223632242).

The spelling of 11111321131 in words is "eleven billion, one hundred eleven million, three hundred twenty-one thousand, one hundred thirty-one".