800700021 has 12 divisors (see below), whose sum is σ = 1261709280. Its totient is φ = 485272680.

The previous prime is 800700007. The next prime is 800700031. The reversal of 800700021 is 120007008.

It is not a de Polignac number, because 800700021 - 2⁹ = 800699509 is a prime.

It is a super-2 number, since 2×800700021² = 1282241047258800882, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 800699967 and 800700003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (800700031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4043841 + ... + 4044038.

It is an arithmetic number, because the mean of its divisors is an integer number (105142440).

Almost surely, 2^800700021 is an apocalyptic number.

It is an amenable number.

800700021 is a deficient number, since it is larger than the sum of its proper divisors (461009259).

800700021 is a wasteful number, since it uses less digits than its factorization.

800700021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8087896 (or 8087893 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 800700021 is about 28296.6432814919. The cubic root of 800700021 is about 928.5884552561.

Adding to 800700021 its reverse (120007008), we get a palindrome (920707029).

The spelling of 800700021 in words is "eight hundred million, seven hundred thousand, twenty-one".