11115016621 has 4 divisors (see below), whose sum is σ = 11115891612. Its totient is φ = 11114141632.

The previous prime is 11115016589. The next prime is 11115016643. The reversal of 11115016621 is 12661051111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2151660996 + 8963355625 = 46386^2 + 94675^2 .

It is a cyclic number.

It is not a de Polignac number, because 11115016621 - 2⁵ = 11115016589 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 (11115016651) 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, 418156 + ... + 443941.

It is an arithmetic number, because the mean of its divisors is an integer number (2778972903).

Almost surely, 2^11115016621 is an apocalyptic number.

It is an amenable number.

11115016621 is a deficient number, since it is larger than the sum of its proper divisors (874991).

11115016621 is an equidigital number, since it uses as much as digits as its factorization.

11115016621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874990.

The product of its (nonzero) digits is 360, while the sum is 25.

Adding to 11115016621 its reverse (12661051111), we get a palindrome (23776067732).

The spelling of 11115016621 in words is "eleven billion, one hundred fifteen million, sixteen thousand, six hundred twenty-one".