10331666221 has 4 divisors (see below), whose sum is σ = 10351964700. Its totient is φ = 10311367744.

The previous prime is 10331666209. The next prime is 10331666239. The reversal of 10331666221 is 12266613301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12266613301 = 1193 ⋅10282157.

It can be written as a sum of positive squares in 2 ways, for example, as 7976990596 + 2354675625 = 89314^2 + 48525^2 .

It is a cyclic number.

It is not a de Polignac number, because 10331666221 - 2¹⁵ = 10331633453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10331666021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10148476 + ... + 10149493.

It is an arithmetic number, because the mean of its divisors is an integer number (2587991175).

Almost surely, 2^10331666221 is an apocalyptic number.

It is an amenable number.

10331666221 is a deficient number, since it is larger than the sum of its proper divisors (20298479).

10331666221 is an equidigital number, since it uses as much as digits as its factorization.

10331666221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20298478.

The product of its (nonzero) digits is 7776, while the sum is 31.

The spelling of 10331666221 in words is "ten billion, three hundred thirty-one million, six hundred sixty-six thousand, two hundred twenty-one".