11771021 has 4 divisors (see below), whose sum is σ = 12463452. Its totient is φ = 11078592.

The previous prime is 11770981. The next prime is 11771063. The reversal of 11771021 is 12017711.

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 5470921 + 6300100 = 2339^2 + 2510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11771021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11770984 and 11771002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11771321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346190 + ... + 346223.

It is an arithmetic number, because the mean of its divisors is an integer number (3115863).

Almost surely, 2^11771021 is an apocalyptic number.

It is an amenable number.

11771021 is a deficient number, since it is larger than the sum of its proper divisors (692431).

11771021 is an equidigital number, since it uses as much as digits as its factorization.

11771021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692430.

The product of its (nonzero) digits is 98, while the sum is 20.

The square root of 11771021 is about 3430.8921580254. The cubic root of 11771021 is about 227.4772895254.

Adding to 11771021 its reverse (12017711), we get a palindrome (23788732).

The spelling of 11771021 in words is "eleven million, seven hundred seventy-one thousand, twenty-one".