15220217 has 4 divisors (see below), whose sum is σ = 15300096. Its totient is φ = 15140340.

The previous prime is 15220193. The next prime is 15220241. The reversal of 15220217 is 71202251.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71202251 = 787 ⋅90473.

It is an interprime number because it is at equal distance from previous prime (15220193) and next prime (15220241).

It is a cyclic number.

It is not a de Polignac number, because 15220217 - 2²² = 11025913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15220267) 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, 39653 + ... + 40034.

It is an arithmetic number, because the mean of its divisors is an integer number (3825024).

Almost surely, 2^15220217 is an apocalyptic number.

It is an amenable number.

15220217 is a deficient number, since it is larger than the sum of its proper divisors (79879).

15220217 is an equidigital number, since it uses as much as digits as its factorization.

15220217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79878.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 15220217 is about 3901.3096518990. The cubic root of 15220217 is about 247.8222418962.

Adding to 15220217 its reverse (71202251), we get a palindrome (86422468).

The spelling of 15220217 in words is "fifteen million, two hundred twenty thousand, two hundred seventeen".