39320221 has 2 divisors, whose sum is σ = 39320222. Its totient is φ = 39320220.

The previous prime is 39320219. The next prime is 39320231. The reversal of 39320221 is 12202393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26894596 + 12425625 = 5186^2 + 3525^2 .

It is a cyclic number.

It is not a de Polignac number, because 39320221 - 2¹ = 39320219 is a prime.

Together with 39320219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 39320192 and 39320201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39320231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19660110 + 19660111.

It is an arithmetic number, because the mean of its divisors is an integer number (19660111).

Almost surely, 2^39320221 is an apocalyptic number.

It is an amenable number.

39320221 is a deficient number, since it is larger than the sum of its proper divisors (1).

39320221 is an equidigital number, since it uses as much as digits as its factorization.

39320221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 39320221 is about 6270.5837846248. The cubic root of 39320221 is about 340.0467669233.

The spelling of 39320221 in words is "thirty-nine million, three hundred twenty thousand, two hundred twenty-one".