800001221 has 8 divisors (see below), whose sum is σ = 854284800. Its totient is φ = 747497520.

The previous prime is 800001211. The next prime is 800001247. The reversal of 800001221 is 122100008.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 800001221 - 2²² = 795806917 is a prime.

It is a Duffinian number.

800001221 is a modest number, since divided by 1221 gives 800 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 800001196 and 800001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (800001211) 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 7 ways as a sum of consecutive naturals, for example, 444041 + ... + 445838.

It is an arithmetic number, because the mean of its divisors is an integer number (106785600).

Almost surely, 2^800001221 is an apocalyptic number.

It is an amenable number.

800001221 is a deficient number, since it is larger than the sum of its proper divisors (54283579).

800001221 is a wasteful number, since it uses less digits than its factorization.

800001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889939.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 800001221 is about 28284.2928318882. The cubic root of 800001221 is about 928.3182390040.

Adding to 800001221 its reverse (122100008), we get a palindrome (922101229).

The spelling of 800001221 in words is "eight hundred million, one thousand, two hundred twenty-one".