120808641732721 has 2 divisors, whose sum is σ = 120808641732722. Its totient is φ = 120808641732720.

The previous prime is 120808641732707. The next prime is 120808641732763. The reversal of 120808641732721 is 127237146808021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79684830276496 + 41123811456225 = 8926636^2 + 6412785^2 .

It is an emirp because it is prime and its reverse (127237146808021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 120808641732721 - 2¹⁹ = 120808641208433 is a prime.

It is not a weakly prime, because it can be changed into another prime (120808641732781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60404320866360 + 60404320866361.

It is an arithmetic number, because the mean of its divisors is an integer number (60404320866361).

Almost surely, 2^{120808641732721} is an apocalyptic number.

It is an amenable number.

120808641732721 is a deficient number, since it is larger than the sum of its proper divisors (1).

120808641732721 is an equidigital number, since it uses as much as digits as its factorization.

120808641732721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1806336, while the sum is 52.

The spelling of 120808641732721 in words is "one hundred twenty trillion, eight hundred eight billion, six hundred forty-one million, seven hundred thirty-two thousand, seven hundred twenty-one".