8142421 has 8 divisors (see below), whose sum is σ = 9504000. Its totient is φ = 6830448.

The previous prime is 8142401. The next prime is 8142467. The reversal of 8142421 is 1242418.

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 8142421 - 2⁵ = 8142389 is a prime.

It is a Duffinian number.

8142421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 8142392 and 8142401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8142401) 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, 12046 + ... + 12703.

It is an arithmetic number, because the mean of its divisors is an integer number (1188000).

Almost surely, 2^8142421 is an apocalyptic number.

It is an amenable number.

8142421 is a deficient number, since it is larger than the sum of its proper divisors (1361579).

8142421 is a wasteful number, since it uses less digits than its factorization.

8142421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24803.

The product of its digits is 512, while the sum is 22.

The square root of 8142421 is about 2853.4927720252. The cubic root of 8142421 is about 201.1798675423.

Adding to 8142421 its reverse (1242418), we get a palindrome (9384839).

The spelling of 8142421 in words is "eight million, one hundred forty-two thousand, four hundred twenty-one".