9740444979821 has 2 divisors, whose sum is σ = 9740444979822. Its totient is φ = 9740444979820.

The previous prime is 9740444979809. The next prime is 9740444979827. The reversal of 9740444979821 is 1289794440479.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7397371875721 + 2343073104100 = 2719811^2 + 1530710^2 .

It is a cyclic number.

It is not a de Polignac number, because 9740444979821 - 2⁶ = 9740444979757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9740444979827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4870222489910 + 4870222489911.

It is an arithmetic number, because the mean of its divisors is an integer number (4870222489911).

Almost surely, 2^{9740444979821} is an apocalyptic number.

It is an amenable number.

9740444979821 is a deficient number, since it is larger than the sum of its proper divisors (1).

9740444979821 is an equidigital number, since it uses as much as digits as its factorization.

9740444979821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 146313216, while the sum is 68.

The spelling of 9740444979821 in words is "nine trillion, seven hundred forty billion, four hundred forty-four million, nine hundred seventy-nine thousand, eight hundred twenty-one".