6870021 has 4 divisors (see below), whose sum is σ = 9160032. Its totient is φ = 4580012.

The previous prime is 6870011. The next prime is 6870029. The reversal of 6870021 is 1200786.

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 a de Polignac number, because none of the positive numbers 2^k-6870021 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 6869973 and 6870000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6870029) 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, 1145001 + ... + 1145006.

It is an arithmetic number, because the mean of its divisors is an integer number (2290008).

Almost surely, 2^6870021 is an apocalyptic number.

It is an amenable number.

6870021 is a deficient number, since it is larger than the sum of its proper divisors (2290011).

6870021 is a wasteful number, since it uses less digits than its factorization.

6870021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2290010.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 6870021 is about 2621.0724904130. The cubic root of 6870021 is about 190.1017091638.

The spelling of 6870021 in words is "six million, eight hundred seventy thousand, twenty-one".