11115414521 has 8 divisors (see below), whose sum is σ = 11773911240. Its totient is φ = 10457434368.

The previous prime is 11115414491. The next prime is 11115414551. The reversal of 11115414521 is 12541451111.

It is an interprime number because it is at equal distance from previous prime (11115414491) and next prime (11115414551).

It can be written as a sum of positive squares in 4 ways, for example, as 3188183296 + 7927231225 = 56464^2 + 89035^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11115414521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11115414551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84386 + ... + 171323.

It is an arithmetic number, because the mean of its divisors is an integer number (1471738905).

Almost surely, 2^11115414521 is an apocalyptic number.

It is an amenable number.

11115414521 is a deficient number, since it is larger than the sum of its proper divisors (658496719).

11115414521 is a wasteful number, since it uses less digits than its factorization.

11115414521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258283.

The product of its digits is 800, while the sum is 26.

Adding to 11115414521 its reverse (12541451111), we get a palindrome (23656865632).

The spelling of 11115414521 in words is "eleven billion, one hundred fifteen million, four hundred fourteen thousand, five hundred twenty-one".