11311131021 has 16 divisors (see below), whose sum is σ = 15268338624. Its totient is φ = 7447400064.

The previous prime is 11311131011. The next prime is 11311131023. The reversal of 11311131021 is 12013111311.

It is not a de Polignac number, because 11311131021 - 2²⁶ = 11244022157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11311131023) 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, 1004595 + ... + 1015791.

It is an arithmetic number, because the mean of its divisors is an integer number (954271164).

Almost surely, 2^11311131021 is an apocalyptic number.

It is an amenable number.

11311131021 is a deficient number, since it is larger than the sum of its proper divisors (3957207603).

11311131021 is a wasteful number, since it uses less digits than its factorization.

11311131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15340.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 11311131021 its reverse (12013111311), we get a palindrome (23324242332).

The spelling of 11311131021 in words is "eleven billion, three hundred eleven million, one hundred thirty-one thousand, twenty-one".