6423021 has 12 divisors (see below), whose sum is σ = 10121280. Its totient is φ = 3892680.

The previous prime is 6423013. The next prime is 6423029. The reversal of 6423021 is 1203246.

It is a happy number.

6423021 is a `hidden beast` number, since 642 + 3 + 0 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (6423013) and next prime (6423029).

It is not a de Polignac number, because 6423021 - 2³ = 6423013 is a prime.

6423021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6422985 and 6423003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6423029) 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, 32341 + ... + 32538.

It is an arithmetic number, because the mean of its divisors is an integer number (843440).

Almost surely, 2^6423021 is an apocalyptic number.

It is an amenable number.

6423021 is a deficient number, since it is larger than the sum of its proper divisors (3698259).

6423021 is a wasteful number, since it uses less digits than its factorization.

6423021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64896 (or 64893 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 6423021 is about 2534.3679685476. The cubic root of 6423021 is about 185.8858994963.

Adding to 6423021 its reverse (1203246), we get a palindrome (7626267).

It can be divided in two parts, 642 and 3021, that added together give a palindrome (3663).

The spelling of 6423021 in words is "six million, four hundred twenty-three thousand, twenty-one".