147221 has 2 divisors, whose sum is σ = 147222. Its totient is φ = 147220.

The previous prime is 147211. The next prime is 147227. The reversal of 147221 is 122741.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130321 + 16900 = 361^2 + 130^2 .

It is an emirp because it is prime and its reverse (122741) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 147221 - 2¹⁰ = 146197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 147221.

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 147221.

It is not a weakly prime, because it can be changed into another prime (147227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73610 + 73611.

It is an arithmetic number, because the mean of its divisors is an integer number (73611).

2¹⁴⁷²²¹ is an apocalyptic number.

It is an amenable number.

147221 is a deficient number, since it is larger than the sum of its proper divisors (1).

147221 is an equidigital number, since it uses as much as digits as its factorization.

147221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112, while the sum is 17.

The square root of 147221 is about 383.6938884058. The cubic root of 147221 is about 52.8027556337.

Adding to 147221 its reverse (122741), we get a palindrome (269962).

The spelling of 147221 in words is "one hundred forty-seven thousand, two hundred twenty-one", and thus it is an iban number.