17220001 has 4 divisors (see below), whose sum is σ = 17586432. Its totient is φ = 16853572.

The previous prime is 17219989. The next prime is 17220011. The reversal of 17220001 is 10002271.

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: 10002271 = 971 ⋅10301.

It is a cyclic number.

It is not a de Polignac number, because 17220001 - 2¹¹ = 17217953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17220011) 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, 183145 + ... + 183238.

It is an arithmetic number, because the mean of its divisors is an integer number (4396608).

Almost surely, 2^17220001 is an apocalyptic number.

17220001 is the 2625-th centered pentagonal number.

It is an amenable number.

17220001 is a deficient number, since it is larger than the sum of its proper divisors (366431).

17220001 is an equidigital number, since it uses as much as digits as its factorization.

17220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366430.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 17220001 is about 4149.6989047400. The cubic root of 17220001 is about 258.2325937650.

Adding to 17220001 its reverse (10002271), we get a palindrome (27222272).

The spelling of 17220001 in words is "seventeen million, two hundred twenty thousand, one".