101221 has 2 divisors, whose sum is σ = 101222. Its totient is φ = 101220.

The previous prime is 101209. The next prime is 101267. The reversal of 101221 is 122101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57121 + 44100 = 239^2 + 210^2 .

It is a cyclic number.

It is not a de Polignac number, because 101221 - 2¹¹ = 99173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50610 + 50611.

It is an arithmetic number, because the mean of its divisors is an integer number (50611).

2¹⁰¹²²¹ is an apocalyptic number.

It is an amenable number.

101221 is a deficient number, since it is larger than the sum of its proper divisors (1).

101221 is an equidigital number, since it uses as much as digits as its factorization.

101221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 101221 is about 318.1524791668. The cubic root of 101221 is about 46.6040373006.

Adding to 101221 its reverse (122101), we get a palindrome (223322).

The spelling of 101221 in words is "one hundred one thousand, two hundred twenty-one", and thus it is an iban number.