11821711 has 4 divisors (see below), whose sum is σ = 12896424. Its totient is φ = 10747000.

The previous prime is 11821699. The next prime is 11821717. The reversal of 11821711 is 11712811.

11821711 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 an emirpimes, since its reverse is a distinct semiprime: 11712811 = 11 ⋅1064801.

It is not a de Polignac number, because 11821711 - 2⁵ = 11821679 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11821717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 537340 + ... + 537361.

It is an arithmetic number, because the mean of its divisors is an integer number (3224106).

Almost surely, 2^11821711 is an apocalyptic number.

11821711 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11821711 is a deficient number, since it is larger than the sum of its proper divisors (1074713).

11821711 is a wasteful number, since it uses less digits than its factorization.

11821711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074712.

The product of its digits is 112, while the sum is 22.

The square root of 11821711 is about 3438.2715134207. The cubic root of 11821711 is about 227.8033533227.

Subtracting from 11821711 its reverse (11712811), we obtain a square (108900 = 330²).

The spelling of 11821711 in words is "eleven million, eight hundred twenty-one thousand, seven hundred eleven".