2120341726865 has 4 divisors (see below), whose sum is σ = 2544410072244. Its totient is φ = 1696273381488.

The previous prime is 2120341726817. The next prime is 2120341726871. The reversal of 2120341726865 is 5686271430212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 580357523344 + 1539984203521 = 761812^2 + 1240961^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120341726865 - 2⁸ = 2120341726609 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212034172682 + ... + 212034172691.

It is an arithmetic number, because the mean of its divisors is an integer number (636102518061).

Almost surely, 2^{2120341726865} is an apocalyptic number.

It is an amenable number.

2120341726865 is a deficient number, since it is larger than the sum of its proper divisors (424068345379).

2120341726865 is an equidigital number, since it uses as much as digits as its factorization.

2120341726865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424068345378.

The product of its (nonzero) digits is 967680, while the sum is 47.

The spelling of 2120341726865 in words is "two trillion, one hundred twenty billion, three hundred forty-one million, seven hundred twenty-six thousand, eight hundred sixty-five".