866902221 has 12 divisors (see below), whose sum is σ = 1254708000. Its totient is φ = 576773640.

The previous prime is 866902219. The next prime is 866902271. The reversal of 866902221 is 122209668.

It is a happy number.

It is not a de Polignac number, because 866902221 - 2¹ = 866902219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866902271) 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 in 11 ways as a sum of consecutive naturals, for example, 92025 + ... + 101006.

It is an arithmetic number, because the mean of its divisors is an integer number (104559000).

Almost surely, 2^866902221 is an apocalyptic number.

It is an amenable number.

866902221 is a deficient number, since it is larger than the sum of its proper divisors (387805779).

866902221 is a wasteful number, since it uses less digits than its factorization.

866902221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193536 (or 193533 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 866902221 is about 29443.2033073849. The cubic root of 866902221 is about 953.5058718989.

The spelling of 866902221 in words is "eight hundred sixty-six million, nine hundred two thousand, two hundred twenty-one".