11111131021 has 8 divisors (see below), whose sum is σ = 11738833920. Its totient is φ = 10499732208.

The previous prime is 11111131007. The next prime is 11111131027. The reversal of 11111131021 is 12013111111.

11111131021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 11111131021 - 2¹⁹ = 11110606733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111130992 and 11111131010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111131027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4074621 + ... + 4077346.

It is an arithmetic number, because the mean of its divisors is an integer number (1467354240).

Almost surely, 2^11111131021 is an apocalyptic number.

It is an amenable number.

11111131021 is a deficient number, since it is larger than the sum of its proper divisors (627702899).

11111131021 is an equidigital number, since it uses as much as digits as its factorization.

11111131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8152043.

The product of its (nonzero) digits is 6, while the sum is 13.

Adding to 11111131021 its reverse (12013111111), we get a palindrome (23124242132).

The spelling of 11111131021 in words is "eleven billion, one hundred eleven million, one hundred thirty-one thousand, twenty-one".