11318208821 has 2 divisors, whose sum is σ = 11318208822. Its totient is φ = 11318208820.

The previous prime is 11318208799. The next prime is 11318208823. The reversal of 11318208821 is 12880281311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6733023025 + 4585185796 = 82055^2 + 67714^2 .

It is a cyclic number.

It is not a de Polignac number, because 11318208821 - 2¹⁴ = 11318192437 is a prime.

Together with 11318208823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11318208823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5659104410 + 5659104411.

It is an arithmetic number, because the mean of its divisors is an integer number (5659104411).

Almost surely, 2^11318208821 is an apocalyptic number.

It is an amenable number.

11318208821 is a deficient number, since it is larger than the sum of its proper divisors (1).

11318208821 is an equidigital number, since it uses as much as digits as its factorization.

11318208821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 35.

The spelling of 11318208821 in words is "eleven billion, three hundred eighteen million, two hundred eight thousand, eight hundred twenty-one".