7942354050821 has 2 divisors, whose sum is σ = 7942354050822. Its totient is φ = 7942354050820.

The previous prime is 7942354050781. The next prime is 7942354050859. The reversal of 7942354050821 is 1280504532497.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4463797072900 + 3478556977921 = 2112770^2 + 1865089^2 .

It is an emirp because it is prime and its reverse (1280504532497) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7942354050821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7942354050821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7942354070821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3971177025410 + 3971177025411.

It is an arithmetic number, because the mean of its divisors is an integer number (3971177025411).

Almost surely, 2^{7942354050821} is an apocalyptic number.

It is an amenable number.

7942354050821 is a deficient number, since it is larger than the sum of its proper divisors (1).

7942354050821 is an equidigital number, since it uses as much as digits as its factorization.

7942354050821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 7942354050821 in words is "seven trillion, nine hundred forty-two billion, three hundred fifty-four million, fifty thousand, eight hundred twenty-one".