39300640921 has 2 divisors, whose sum is σ = 39300640922. Its totient is φ = 39300640920.

The previous prime is 39300640913. The next prime is 39300640927. The reversal of 39300640921 is 12904600393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38902039696 + 398601225 = 197236^2 + 19965^2 .

It is an emirp because it is prime and its reverse (12904600393) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39300640921 - 2³ = 39300640913 is a prime.

It is not a weakly prime, because it can be changed into another prime (39300640927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19650320460 + 19650320461.

It is an arithmetic number, because the mean of its divisors is an integer number (19650320461).

Almost surely, 2^39300640921 is an apocalyptic number.

It is an amenable number.

39300640921 is a deficient number, since it is larger than the sum of its proper divisors (1).

39300640921 is an equidigital number, since it uses as much as digits as its factorization.

39300640921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 37.

The spelling of 39300640921 in words is "thirty-nine billion, three hundred million, six hundred forty thousand, nine hundred twenty-one".