6822421 has 4 divisors (see below), whose sum is σ = 7119072. Its totient is φ = 6525772.

The previous prime is 6822401. The next prime is 6822481. The reversal of 6822421 is 1242286.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1242286 = 2 ⋅621143.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6822421 is a prime.

It is a Duffinian number.

6822421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6822401) 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, 148291 + ... + 148336.

It is an arithmetic number, because the mean of its divisors is an integer number (1779768).

Almost surely, 2^6822421 is an apocalyptic number.

It is an amenable number.

6822421 is a deficient number, since it is larger than the sum of its proper divisors (296651).

6822421 is a wasteful number, since it uses less digits than its factorization.

6822421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296650.

The product of its digits is 1536, while the sum is 25.

The square root of 6822421 is about 2611.9764547178. The cubic root of 6822421 is about 189.6616415648.

The spelling of 6822421 in words is "six million, eight hundred twenty-two thousand, four hundred twenty-one".