8513421 has 8 divisors (see below), whose sum is σ = 12972864. Its totient is φ = 4864800.

The previous prime is 8513389. The next prime is 8513429. The reversal of 8513421 is 1243158.

8513421 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 8513421 - 2⁵ = 8513389 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 8513391 and 8513400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8513429) 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, 202680 + ... + 202721.

It is an arithmetic number, because the mean of its divisors is an integer number (1621608).

Almost surely, 2^8513421 is an apocalyptic number.

It is an amenable number.

8513421 is a deficient number, since it is larger than the sum of its proper divisors (4459443).

8513421 is a wasteful number, since it uses less digits than its factorization.

8513421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405411.

The product of its digits is 960, while the sum is 24.

The square root of 8513421 is about 2917.7767220951. The cubic root of 8513421 is about 204.1901101684.

Adding to 8513421 its reverse (1243158), we get a palindrome (9756579).

The spelling of 8513421 in words is "eight million, five hundred thirteen thousand, four hundred twenty-one".