800121221 has 4 divisors (see below), whose sum is σ = 800334444. Its totient is φ = 799908000.

The previous prime is 800121211. The next prime is 800121227. The reversal of 800121221 is 122121008.

It is a happy number.

800121221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 380445025 + 419676196 = 19505^2 + 20486^2 .

It is a cyclic number.

It is not a de Polignac number, because 800121221 - 2¹⁰ = 800120197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 800121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (800121227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100880 + ... + 108521.

It is an arithmetic number, because the mean of its divisors is an integer number (200083611).

Almost surely, 2^800121221 is an apocalyptic number.

It is an amenable number.

800121221 is a deficient number, since it is larger than the sum of its proper divisors (213223).

800121221 is a wasteful number, since it uses less digits than its factorization.

800121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213222.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 800121221 is about 28286.4140710695. The cubic root of 800121221 is about 928.3646525245.

Adding to 800121221 its reverse (122121008), we get a palindrome (922242229).

The spelling of 800121221 in words is "eight hundred million, one hundred twenty-one thousand, two hundred twenty-one".