2120343013555 has 16 divisors (see below), whose sum is σ = 2740668394464. Its totient is φ = 1565487302400.

The previous prime is 2120343013553. The next prime is 2120343013601. The reversal of 2120343013555 is 5553103430212.

It is not a de Polignac number, because 2120343013555 - 2¹ = 2120343013553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2120343013555.

It is not an unprimeable number, because it can be changed into a prime (2120343013553) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2834346 + ... + 3503455.

It is an arithmetic number, because the mean of its divisors is an integer number (171291774654).

Almost surely, 2^{2120343013555} is an apocalyptic number.

2120343013555 is a deficient number, since it is larger than the sum of its proper divisors (620325380909).

2120343013555 is a wasteful number, since it uses less digits than its factorization.

2120343013555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6342966.

The product of its (nonzero) digits is 54000, while the sum is 34.

Adding to 2120343013555 its reverse (5553103430212), we get a palindrome (7673446443767).

The spelling of 2120343013555 in words is "two trillion, one hundred twenty billion, three hundred forty-three million, thirteen thousand, five hundred fifty-five".