11865692221 has 2 divisors, whose sum is σ = 11865692222. Its totient is φ = 11865692220.

The previous prime is 11865692129. The next prime is 11865692263. The reversal of 11865692221 is 12229656811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10709352196 + 1156340025 = 103486^2 + 34005^2 .

It is a cyclic number.

It is not a de Polignac number, because 11865692221 - 2⁷ = 11865692093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11863692221) 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 as a sum of consecutive naturals, namely, 5932846110 + 5932846111.

It is an arithmetic number, because the mean of its divisors is an integer number (5932846111).

Almost surely, 2^11865692221 is an apocalyptic number.

It is an amenable number.

11865692221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11865692221 is an equidigital number, since it uses as much as digits as its factorization.

11865692221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 43.

The spelling of 11865692221 in words is "eleven billion, eight hundred sixty-five million, six hundred ninety-two thousand, two hundred twenty-one".