11720211513 has 4 divisors (see below), whose sum is σ = 15626948688. Its totient is φ = 7813474340.

The previous prime is 11720211511. The next prime is 11720211533. The reversal of 11720211513 is 31511202711.

11720211513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 31511202711 = 3 ⋅10503734237.

It is a cyclic number.

It is not a de Polignac number, because 11720211513 - 2¹ = 11720211511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11720211511) 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, 1953368583 + ... + 1953368588.

It is an arithmetic number, because the mean of its divisors is an integer number (3906737172).

Almost surely, 2^11720211513 is an apocalyptic number.

It is an amenable number.

11720211513 is a deficient number, since it is larger than the sum of its proper divisors (3906737175).

11720211513 is an equidigital number, since it uses as much as digits as its factorization.

11720211513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3906737174.

The product of its (nonzero) digits is 420, while the sum is 24.

The spelling of 11720211513 in words is "eleven billion, seven hundred twenty million, two hundred eleven thousand, five hundred thirteen".