8506421 has 20 divisors (see below), whose sum is σ = 10822560. Its totient is φ = 6548520.

The previous prime is 8506403. The next prime is 8506423. The reversal of 8506421 is 1246058.

8506421 = 326² + 327² + ... + 391².

It is not a de Polignac number, because 8506421 - 2¹⁸ = 8244277 is a prime.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8506423) 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, 102446 + ... + 102528.

It is an arithmetic number, because the mean of its divisors is an integer number (541128).

Almost surely, 2^8506421 is an apocalyptic number.

It is an amenable number.

8506421 is a deficient number, since it is larger than the sum of its proper divisors (2316139).

8506421 is an frugal number, since it uses more digits than its factorization.

8506421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 8506421 is about 2916.5769319529. The cubic root of 8506421 is about 204.1341309994.

The spelling of 8506421 in words is "eight million, five hundred six thousand, four hundred twenty-one".