221401 has 2 divisors, whose sum is σ = 221402. Its totient is φ = 221400.

The previous prime is 221399. The next prime is 221411. The reversal of 221401 is 104122.

221401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (221411) can be obtained adding 221401 to its sum of digits (10).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211600 + 9801 = 460^2 + 99^2 .

It is a cyclic number.

It is not a de Polignac number, because 221401 - 2¹ = 221399 is a prime.

Together with 221399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (221411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110700 + 110701.

It is an arithmetic number, because the mean of its divisors is an integer number (110701).

2²²¹⁴⁰¹ is an apocalyptic number.

It is an amenable number.

221401 is a deficient number, since it is larger than the sum of its proper divisors (1).

221401 is an equidigital number, since it uses as much as digits as its factorization.

221401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 221401 is about 470.5326768674. The cubic root of 221401 is about 60.4959813372.

Adding to 221401 its reverse (104122), we get a palindrome (325523).

The spelling of 221401 in words is "two hundred twenty-one thousand, four hundred one", and thus it is an iban number.