217442201 has 4 divisors (see below), whose sum is σ = 218210832. Its totient is φ = 216673572.

The previous prime is 217442191. The next prime is 217442209. The reversal of 217442201 is 102244712.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217442201 is a prime.

It is a super-2 number, since 2×217442201² = 94562221551448802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217442209) 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, 383891 + ... + 384456.

It is an arithmetic number, because the mean of its divisors is an integer number (54552708).

Almost surely, 2^217442201 is an apocalyptic number.

It is an amenable number.

217442201 is a deficient number, since it is larger than the sum of its proper divisors (768631).

217442201 is an equidigital number, since it uses as much as digits as its factorization.

217442201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768630.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 217442201 is about 14745.9215039278. The cubic root of 217442201 is about 601.3324102443.

Adding to 217442201 its reverse (102244712), we get a palindrome (319686913).

The spelling of 217442201 in words is "two hundred seventeen million, four hundred forty-two thousand, two hundred one".