6866039221 has 2 divisors, whose sum is σ = 6866039222. Its totient is φ = 6866039220.

The previous prime is 6866039207. The next prime is 6866039249. The reversal of 6866039221 is 1229306686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6038844100 + 827195121 = 77710^2 + 28761^2 .

It is a cyclic number.

It is not a de Polignac number, because 6866039221 - 2⁹ = 6866038709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6866039261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3433019610 + 3433019611.

It is an arithmetic number, because the mean of its divisors is an integer number (3433019611).

Almost surely, 2^6866039221 is an apocalyptic number.

It is an amenable number.

6866039221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6866039221 is an equidigital number, since it uses as much as digits as its factorization.

6866039221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 6866039221 is about 82861.5666096170. The cubic root of 6866039221 is about 1900.6497520141.

The spelling of 6866039221 in words is "six billion, eight hundred sixty-six million, thirty-nine thousand, two hundred twenty-one".