40240803636821 has 2 divisors, whose sum is σ = 40240803636822. Its totient is φ = 40240803636820.

The previous prime is 40240803636799. The next prime is 40240803636833. The reversal of 40240803636821 is 12863630804204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37370113872100 + 2870689764721 = 6113110^2 + 1694311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40240803636821 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 (40240803636851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20120401818410 + 20120401818411.

It is an arithmetic number, because the mean of its divisors is an integer number (20120401818411).

Almost surely, 2^{40240803636821} is an apocalyptic number.

It is an amenable number.

40240803636821 is a deficient number, since it is larger than the sum of its proper divisors (1).

40240803636821 is an equidigital number, since it uses as much as digits as its factorization.

40240803636821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1327104, while the sum is 47.

The spelling of 40240803636821 in words is "forty trillion, two hundred forty billion, eight hundred three million, six hundred thirty-six thousand, eight hundred twenty-one".