800012021 has 4 divisors (see below), whose sum is σ = 807779232. Its totient is φ = 792244812.

The previous prime is 800011991. The next prime is 800012029. The reversal of 800012021 is 120210008.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 800012021 - 2¹⁰ = 800010997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 800011987 and 800012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (800012029) 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, 3883451 + ... + 3883656.

It is an arithmetic number, because the mean of its divisors is an integer number (201944808).

Almost surely, 2^800012021 is an apocalyptic number.

It is an amenable number.

800012021 is a deficient number, since it is larger than the sum of its proper divisors (7767211).

800012021 is a wasteful number, since it uses less digits than its factorization.

800012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7767210.

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

The square root of 800012021 is about 28284.4837499290. The cubic root of 800012021 is about 928.3224164109.

Adding to 800012021 its reverse (120210008), we get a palindrome (920222029).

The spelling of 800012021 in words is "eight hundred million, twelve thousand, twenty-one".