8107421 has 4 divisors (see below), whose sum is σ = 9265632. Its totient is φ = 6949212.

The previous prime is 8107417. The next prime is 8107423. The reversal of 8107421 is 1247018.

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.

It is a cyclic number.

It is not a de Polignac number, because 8107421 - 2² = 8107417 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8107423) 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, 579095 + ... + 579108.

It is an arithmetic number, because the mean of its divisors is an integer number (2316408).

Almost surely, 2^8107421 is an apocalyptic number.

It is an amenable number.

8107421 is a deficient number, since it is larger than the sum of its proper divisors (1158211).

8107421 is a wasteful number, since it uses less digits than its factorization.

8107421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158210.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 8107421 is about 2847.3533324826. The cubic root of 8107421 is about 200.8911979327.

The spelling of 8107421 in words is "eight million, one hundred seven thousand, four hundred twenty-one".