11256416621 has 2 divisors, whose sum is σ = 11256416622.
Its totient is φ = 11256416620.
The previous prime is 11256416581. The next prime is 11256416623. The reversal of 11256416621 is 12661465211.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 6116960521 + 5139456100 = 78211^2 + 71690^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-11256416621 is a prime.
It is a Sophie Germain prime.
Together with 11256416623, 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 (11256416623) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5628208310 + 5628208311.
It is an arithmetic number, because the mean of its divisors is an integer number (5628208311).
Almost surely, 211256416621 is an apocalyptic number.
It is an amenable number.
11256416621 is a deficient number, since it is larger than the sum of its proper divisors (1).
11256416621 is an equidigital number, since it uses as much as digits as its factorization.
11256416621 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 17280, while the sum is 35.
The spelling of 11256416621 in words is "eleven billion, two hundred fifty-six million, four hundred sixteen thousand, six hundred twenty-one".