6945021 has 20 divisors (see below), whose sum is σ = 10454400. Its totient is φ = 4594536.

The previous prime is 6945017. The next prime is 6945047. The reversal of 6945021 is 1205496.

It is not a de Polignac number, because 6945021 - 2² = 6945017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6945091) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14260 + ... + 14738.

It is an arithmetic number, because the mean of its divisors is an integer number (522720).

Almost surely, 2^6945021 is an apocalyptic number.

It is an amenable number.

6945021 is a deficient number, since it is larger than the sum of its proper divisors (3509379).

6945021 is a wasteful number, since it uses less digits than its factorization.

6945021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670 (or 661 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 6945021 is about 2635.3407749284. The cubic root of 6945021 is about 190.7909868770.

The spelling of 6945021 in words is "six million, nine hundred forty-five thousand, twenty-one".