11440021231 has 4 divisors (see below), whose sum is σ = 11749211032. Its totient is φ = 11130831432.

The previous prime is 11440021217. The next prime is 11440021253. The reversal of 11440021231 is 13212004411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13212004411 = 29 ⋅455586359.

It is a cyclic number.

It is not a de Polignac number, because 11440021231 - 2¹¹ = 11440019183 is a prime.

It is a super-2 number, since 2×11440021231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11440021199 and 11440021208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11440021631) 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, 154594845 + ... + 154594918.

It is an arithmetic number, because the mean of its divisors is an integer number (2937302758).

Almost surely, 2^11440021231 is an apocalyptic number.

11440021231 is a deficient number, since it is larger than the sum of its proper divisors (309189801).

11440021231 is an equidigital number, since it uses as much as digits as its factorization.

11440021231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309189800.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 11440021231 its reverse (13212004411), we get a palindrome (24652025642).

The spelling of 11440021231 in words is "eleven billion, four hundred forty million, twenty-one thousand, two hundred thirty-one".