39942886121 has 2 divisors, whose sum is σ = 39942886122. Its totient is φ = 39942886120.

The previous prime is 39942886091. The next prime is 39942886157. The reversal of 39942886121 is 12168824993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37690339600 + 2252546521 = 194140^2 + 47461^2 .

It is a cyclic number.

It is not a de Polignac number, because 39942886121 - 2¹⁸ = 39942623977 is a prime.

It is not a weakly prime, because it can be changed into another prime (39942886721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19971443060 + 19971443061.

It is an arithmetic number, because the mean of its divisors is an integer number (19971443061).

Almost surely, 2^39942886121 is an apocalyptic number.

It is an amenable number.

39942886121 is a deficient number, since it is larger than the sum of its proper divisors (1).

39942886121 is an equidigital number, since it uses as much as digits as its factorization.

39942886121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1492992, while the sum is 53.

The spelling of 39942886121 in words is "thirty-nine billion, nine hundred forty-two million, eight hundred eighty-six thousand, one hundred twenty-one".