11515221045 has 12 divisors (see below), whose sum is σ = 19959716556. Its totient is φ = 6141451200.

The previous prime is 11515221019. The next prime is 11515221059. The reversal of 11515221045 is 54012251511.

It is a happy number.

11515221045 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6950056689 + 4565164356 = 83367^2 + 67566^2 .

It is not a de Polignac number, because 11515221045 - 2⁹ = 11515220533 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 127946856 + ... + 127946945.

It is an arithmetic number, because the mean of its divisors is an integer number (1663309713).

Almost surely, 2^11515221045 is an apocalyptic number.

11515221045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11515221045 is a deficient number, since it is larger than the sum of its proper divisors (8444495511).

11515221045 is a wasteful number, since it uses less digits than its factorization.

11515221045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255893812 (or 255893809 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

Adding to 11515221045 its reverse (54012251511), we get a palindrome (65527472556).

The spelling of 11515221045 in words is "eleven billion, five hundred fifteen million, two hundred twenty-one thousand, forty-five".