39208890221 has 2 divisors, whose sum is σ = 39208890222. Its totient is φ = 39208890220.

The previous prime is 39208890209. The next prime is 39208890283. The reversal of 39208890221 is 12209880293.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37991857225 + 1217032996 = 194915^2 + 34886^2 .

It is a cyclic number.

It is not a de Polignac number, because 39208890221 - 2³⁰ = 38135148397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39208890421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19604445110 + 19604445111.

It is an arithmetic number, because the mean of its divisors is an integer number (19604445111).

Almost surely, 2^39208890221 is an apocalyptic number.

It is an amenable number.

39208890221 is a deficient number, since it is larger than the sum of its proper divisors (1).

39208890221 is an equidigital number, since it uses as much as digits as its factorization.

39208890221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 44.

The spelling of 39208890221 in words is "thirty-nine billion, two hundred eight million, eight hundred ninety thousand, two hundred twenty-one".