11215021817 has 8 divisors (see below), whose sum is σ = 11252157000. Its totient is φ = 11177915904.

The previous prime is 11215021799. The next prime is 11215021819. The reversal of 11215021817 is 71812051211.

It can be written as a sum of positive squares in 4 ways, for example, as 2513117161 + 8701904656 = 50131^2 + 93284^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 11215021817 - 2⁸ = 11215021561 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 11215021817.

It is not an unprimeable number, because it can be changed into a prime (11215021819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 970409 + ... + 981897.

It is an arithmetic number, because the mean of its divisors is an integer number (1406519625).

Almost surely, 2^11215021817 is an apocalyptic number.

It is an amenable number.

11215021817 is a deficient number, since it is larger than the sum of its proper divisors (37135183).

11215021817 is a wasteful number, since it uses less digits than its factorization.

11215021817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14635.

The product of its (nonzero) digits is 1120, while the sum is 29.

The spelling of 11215021817 in words is "eleven billion, two hundred fifteen million, twenty-one thousand, eight hundred seventeen".