19989732340241 has 2 divisors, whose sum is σ = 19989732340242. Its totient is φ = 19989732340240.

The previous prime is 19989732340231. The next prime is 19989732340289. The reversal of 19989732340241 is 14204323798991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19978262787025 + 11469553216 = 4469705^2 + 107096^2 .

It is a cyclic number.

It is not a de Polignac number, because 19989732340241 - 2¹⁸ = 19989732078097 is a prime.

It is not a weakly prime, because it can be changed into another prime (19989732340231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9994866170120 + 9994866170121.

It is an arithmetic number, because the mean of its divisors is an integer number (9994866170121).

Almost surely, 2^{19989732340241} is an apocalyptic number.

It is an amenable number.

19989732340241 is a deficient number, since it is larger than the sum of its proper divisors (1).

19989732340241 is an equidigital number, since it uses as much as digits as its factorization.

19989732340241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23514624, while the sum is 62.

The spelling of 19989732340241 in words is "nineteen trillion, nine hundred eighty-nine billion, seven hundred thirty-two million, three hundred forty thousand, two hundred forty-one".