402221 has 2 divisors, whose sum is σ = 402222. Its totient is φ = 402220.

The previous prime is 402197. The next prime is 402223. The reversal of 402221 is 122204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 373321 + 28900 = 611^2 + 170^2 .

It is a cyclic number.

It is not a de Polignac number, because 402221 - 2¹⁴ = 385837 is a prime.

It is a Sophie Germain prime.

Together with 402223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201110 + 201111.

It is an arithmetic number, because the mean of its divisors is an integer number (201111).

2⁴⁰²²²¹ is an apocalyptic number.

It is an amenable number.

402221 is a deficient number, since it is larger than the sum of its proper divisors (1).

402221 is an equidigital number, since it uses as much as digits as its factorization.

402221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 402221 is about 634.2089561020. The cubic root of 402221 is about 73.8167489153.

Adding to 402221 its reverse (122204), we get a palindrome (524425).

The spelling of 402221 in words is "four hundred two thousand, two hundred twenty-one", and thus it is an iban number.