11040265721 has 4 divisors (see below), whose sum is σ = 11180016000. Its totient is φ = 10900515444.

The previous prime is 11040265703. The next prime is 11040265727. The reversal of 11040265721 is 12756204011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12756204011 = 557 ⋅22901623.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11040265721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11040265727) 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, 69875021 + ... + 69875178.

It is an arithmetic number, because the mean of its divisors is an integer number (2795004000).

Almost surely, 2^11040265721 is an apocalyptic number.

It is an amenable number.

11040265721 is a deficient number, since it is larger than the sum of its proper divisors (139750279).

11040265721 is an equidigital number, since it uses as much as digits as its factorization.

11040265721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139750278.

The product of its (nonzero) digits is 3360, while the sum is 29.

Adding to 11040265721 its reverse (12756204011), we get a palindrome (23796469732).

The spelling of 11040265721 in words is "eleven billion, forty million, two hundred sixty-five thousand, seven hundred twenty-one".