11051321312521 has 4 divisors (see below), whose sum is σ = 12630081500032. Its totient is φ = 9472561125012.

The previous prime is 11051321312519. The next prime is 11051321312659. The reversal of 11051321312521 is 12521312315011.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 11051321312521 - 2¹ = 11051321312519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11051321312521.

It is not an unprimeable number, because it can be changed into a prime (11051321312021) 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, 789380093745 + ... + 789380093758.

It is an arithmetic number, because the mean of its divisors is an integer number (3157520375008).

Almost surely, 2^{11051321312521} is an apocalyptic number.

It is an amenable number.

11051321312521 is a deficient number, since it is larger than the sum of its proper divisors (1578760187511).

11051321312521 is an equidigital number, since it uses as much as digits as its factorization.

11051321312521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578760187510.

The product of its (nonzero) digits is 1800, while the sum is 28.

Adding to 11051321312521 its reverse (12521312315011), we get a palindrome (23572633627532).

The spelling of 11051321312521 in words is "eleven trillion, fifty-one billion, three hundred twenty-one million, three hundred twelve thousand, five hundred twenty-one".