207221 has 6 divisors (see below), whose sum is σ = 241110. Its totient is φ = 177576.

The previous prime is 207199. The next prime is 207227. The reversal of 207221 is 122702.

It can be written as a sum of positive squares in only one way, i.e., 207025 + 196 = 455^2 + 14^2 .

It is not a de Polignac number, because 207221 - 2¹⁰ = 206197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 207196 and 207205.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 207221.

It is not an unprimeable number, because it can be changed into a prime (207227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2066 + ... + 2163.

It is an arithmetic number, because the mean of its divisors is an integer number (40185).

2²⁰⁷²²¹ is an apocalyptic number.

It is an amenable number.

207221 is a deficient number, since it is larger than the sum of its proper divisors (33889).

207221 is an equidigital number, since it uses as much as digits as its factorization.

207221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4243 (or 4236 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 207221 is about 455.2153336609. The cubic root of 207221 is about 59.1758613848.

Adding to 207221 its reverse (122702), we get a palindrome (329923).

The spelling of 207221 in words is "two hundred seven thousand, two hundred twenty-one", and thus it is an iban number.