11057121517 has 4 divisors (see below), whose sum is σ = 11907669340. Its totient is φ = 10206573696.

The previous prime is 11057121503. The next prime is 11057121541. The reversal of 11057121517 is 71512175011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71512175011 = 183707 ⋅389273.

It can be written as a sum of positive squares in 2 ways, for example, as 1375742281 + 9681379236 = 37091^2 + 98394^2 .

It is a cyclic number.

It is not a de Polignac number, because 11057121517 - 2⁷ = 11057121389 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 (11057121557) 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, 425273892 + ... + 425273917.

It is an arithmetic number, because the mean of its divisors is an integer number (2976917335).

Almost surely, 2^11057121517 is an apocalyptic number.

It is an amenable number.

11057121517 is a deficient number, since it is larger than the sum of its proper divisors (850547823).

11057121517 is an equidigital number, since it uses as much as digits as its factorization.

11057121517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850547822.

The product of its (nonzero) digits is 2450, while the sum is 31.

Adding to 11057121517 its reverse (71512175011), we get a palindrome (82569296528).

The spelling of 11057121517 in words is "eleven billion, fifty-seven million, one hundred twenty-one thousand, five hundred seventeen".