39929802221 has 2 divisors, whose sum is σ = 39929802222. Its totient is φ = 39929802220.

The previous prime is 39929802197. The next prime is 39929802301. The reversal of 39929802221 is 12220892993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39646384996 + 283417225 = 199114^2 + 16835^2 .

It is an emirp because it is prime and its reverse (12220892993) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39929802221 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 (39929892221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19964901110 + 19964901111.

It is an arithmetic number, because the mean of its divisors is an integer number (19964901111).

Almost surely, 2^39929802221 is an apocalyptic number.

It is an amenable number.

39929802221 is a deficient number, since it is larger than the sum of its proper divisors (1).

39929802221 is an equidigital number, since it uses as much as digits as its factorization.

39929802221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 47.

The spelling of 39929802221 in words is "thirty-nine billion, nine hundred twenty-nine million, eight hundred two thousand, two hundred twenty-one".