8242421 has 8 divisors (see below), whose sum is σ = 9048864. Its totient is φ = 7445520.

The previous prime is 8242411. The next prime is 8242439. The reversal of 8242421 is 1242428.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8242421 - 2¹⁰ = 8241397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8242411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506 + ... + 4091.

It is an arithmetic number, because the mean of its divisors is an integer number (1131108).

Almost surely, 2^8242421 is an apocalyptic number.

It is an amenable number.

8242421 is a deficient number, since it is larger than the sum of its proper divisors (806443).

8242421 is a wasteful number, since it uses less digits than its factorization.

8242421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4771.

The product of its digits is 1024, while the sum is 23.

The square root of 8242421 is about 2870.9616855681. The cubic root of 8242421 is about 202.0001061987. Note that the first 3 decimals are identical.

Adding to 8242421 its reverse (1242428), we get a palindrome (9484849).

The spelling of 8242421 in words is "eight million, two hundred forty-two thousand, four hundred twenty-one".