340120505521 has 4 divisors (see below), whose sum is σ = 341901241344. Its totient is φ = 338339769700.

The previous prime is 340120505519. The next prime is 340120505551. The reversal of 340120505521 is 125505021043.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125505021043 = 18743 ⋅6696101.

It is a cyclic number.

It is not a de Polignac number, because 340120505521 - 2¹ = 340120505519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 340120505521.

It is not an unprimeable number, because it can be changed into a prime (340120505551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 890367625 + ... + 890368006.

It is an arithmetic number, because the mean of its divisors is an integer number (85475310336).

Almost surely, 2^340120505521 is an apocalyptic number.

It is an amenable number.

340120505521 is a deficient number, since it is larger than the sum of its proper divisors (1780735823).

340120505521 is a wasteful number, since it uses less digits than its factorization.

340120505521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1780735822.

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 340120505521 its reverse (125505021043), we get a palindrome (465625526564).

The spelling of 340120505521 in words is "three hundred forty billion, one hundred twenty million, five hundred five thousand, five hundred twenty-one".