11777021 has 2 divisors, whose sum is σ = 11777022. Its totient is φ = 11777020.

The previous prime is 11777011. The next prime is 11777023. The reversal of 11777021 is 12077711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7425625 + 4351396 = 2725^2 + 2086^2 .

It is a cyclic number.

It is not a de Polignac number, because 11777021 - 2⁶ = 11776957 is a prime.

It is a Sophie Germain prime.

Together with 11777023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11777023) 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 as a sum of consecutive naturals, namely, 5888510 + 5888511.

It is an arithmetic number, because the mean of its divisors is an integer number (5888511).

Almost surely, 2^11777021 is an apocalyptic number.

It is an amenable number.

11777021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11777021 is an equidigital number, since it uses as much as digits as its factorization.

11777021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 686, while the sum is 26.

The square root of 11777021 is about 3431.7664547577. The cubic root of 11777021 is about 227.5159333525.

The spelling of 11777021 in words is "eleven million, seven hundred seventy-seven thousand, twenty-one".