6988021 has 4 divisors (see below), whose sum is σ = 7291872. Its totient is φ = 6684172.

The previous prime is 6987983. The next prime is 6988039. The reversal of 6988021 is 1208896.

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 6988021 - 2⁹ = 6987509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6988321) 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, 151891 + ... + 151936.

It is an arithmetic number, because the mean of its divisors is an integer number (1822968).

Almost surely, 2^6988021 is an apocalyptic number.

It is an amenable number.

6988021 is a deficient number, since it is larger than the sum of its proper divisors (303851).

6988021 is a wasteful number, since it uses less digits than its factorization.

6988021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303850.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 6988021 is about 2643.4865235140. The cubic root of 6988021 is about 191.1839369132.

The spelling of 6988021 in words is "six million, nine hundred eighty-eight thousand, twenty-one".