801668221 has 16 divisors (see below), whose sum is σ = 834169600. Its totient is φ = 769886208.

The previous prime is 801668213. The next prime is 801668249. The reversal of 801668221 is 122866108.

It is a cyclic number.

It is not a de Polignac number, because 801668221 - 2³ = 801668213 is a prime.

It is a super-2 number, since 2×801668221² = 1285343873122609682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (801668321) 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 15 ways as a sum of consecutive naturals, for example, 1389085 + ... + 1389661.

It is an arithmetic number, because the mean of its divisors is an integer number (52135600).

Almost surely, 2^801668221 is an apocalyptic number.

It is an amenable number.

801668221 is a deficient number, since it is larger than the sum of its proper divisors (32501379).

801668221 is a wasteful number, since it uses less digits than its factorization.

801668221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 801668221 is about 28313.7461491764. The cubic root of 801668221 is about 928.9625850524.

The spelling of 801668221 in words is "eight hundred one million, six hundred sixty-eight thousand, two hundred twenty-one".