15211045217 has 4 divisors (see below), whose sum is σ = 15460406676. Its totient is φ = 14961683760.

The previous prime is 15211045189. The next prime is 15211045231. The reversal of 15211045217 is 71254011251.

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 1615718416 + 13595326801 = 40196^2 + 116599^2 .

It is a cyclic number.

It is not a de Polignac number, because 15211045217 - 2¹⁰ = 15211044193 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 15211045217.

It is not an unprimeable number, because it can be changed into a prime (15211041217) 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, 124680638 + ... + 124680759.

It is an arithmetic number, because the mean of its divisors is an integer number (3865101669).

Almost surely, 2^15211045217 is an apocalyptic number.

It is an amenable number.

15211045217 is a deficient number, since it is larger than the sum of its proper divisors (249361459).

15211045217 is an equidigital number, since it uses as much as digits as its factorization.

15211045217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249361458.

The product of its (nonzero) digits is 2800, while the sum is 29.

Adding to 15211045217 its reverse (71254011251), we get a palindrome (86465056468).

The spelling of 15211045217 in words is "fifteen billion, two hundred eleven million, forty-five thousand, two hundred seventeen".