4217321 has 2 divisors, whose sum is σ = 4217322. Its totient is φ = 4217320.

The previous prime is 4217287. The next prime is 4217341. The reversal of 4217321 is 1237124.

It is an a-pointer prime, because the next prime (4217341) can be obtained adding 4217321 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3748096 + 469225 = 1936^2 + 685^2 .

It is a cyclic number.

It is not a de Polignac number, because 4217321 - 2¹⁰ = 4216297 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 4217293 and 4217302.

It is not a weakly prime, because it can be changed into another prime (4217341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2108660 + 2108661.

It is an arithmetic number, because the mean of its divisors is an integer number (2108661).

Almost surely, 2^4217321 is an apocalyptic number.

It is an amenable number.

4217321 is a deficient number, since it is larger than the sum of its proper divisors (1).

4217321 is an equidigital number, since it uses as much as digits as its factorization.

4217321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 20.

The square root of 4217321 is about 2053.6116964996. The cubic root of 4217321 is about 161.5643556200.

The spelling of 4217321 in words is "four million, two hundred seventeen thousand, three hundred twenty-one".