150221 has 2 divisors, whose sum is σ = 150222. Its totient is φ = 150220.

The previous prime is 150217. The next prime is 150223. The reversal of 150221 is 122051.

150221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148996 + 1225 = 386^2 + 35^2 .

It is an emirp because it is prime and its reverse (122051) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 150221 - 2² = 150217 is a prime.

Together with 150223, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (150223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75110 + 75111.

It is an arithmetic number, because the mean of its divisors is an integer number (75111).

2¹⁵⁰²²¹ is an apocalyptic number.

It is an amenable number.

150221 is a deficient number, since it is larger than the sum of its proper divisors (1).

150221 is an equidigital number, since it uses as much as digits as its factorization.

150221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 150221 is about 387.5835393822. The cubic root of 150221 is about 53.1590098260.

Adding to 150221 its reverse (122051), we get a palindrome (272272).

The spelling of 150221 in words is "one hundred fifty thousand, two hundred twenty-one".