11365126221 has 4 divisors (see below), whose sum is σ = 15153501632. Its totient is φ = 7576750812.

The previous prime is 11365126211. The next prime is 11365126249. The reversal of 11365126221 is 12262156311.

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.

It is not a de Polignac number, because 11365126221 - 2⁵ = 11365126189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11365126211) 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, 1894187701 + ... + 1894187706.

It is an arithmetic number, because the mean of its divisors is an integer number (3788375408).

Almost surely, 2^11365126221 is an apocalyptic number.

It is an amenable number.

11365126221 is a deficient number, since it is larger than the sum of its proper divisors (3788375411).

11365126221 is an equidigital number, since it uses as much as digits as its factorization.

11365126221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3788375410.

The product of its digits is 4320, while the sum is 30.

The spelling of 11365126221 in words is "eleven billion, three hundred sixty-five million, one hundred twenty-six thousand, two hundred twenty-one".