8207421 has 16 divisors (see below), whose sum is σ = 11430720. Its totient is φ = 5233280.

The previous prime is 8207399. The next prime is 8207429. The reversal of 8207421 is 1247028.

It is a cyclic number.

It is not a de Polignac number, because 8207421 - 2¹³ = 8199229 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 8207391 and 8207400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8207429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5890 + ... + 7148.

It is an arithmetic number, because the mean of its divisors is an integer number (714420).

Almost surely, 2^8207421 is an apocalyptic number.

It is an amenable number.

8207421 is a deficient number, since it is larger than the sum of its proper divisors (3223299).

8207421 is a wasteful number, since it uses less digits than its factorization.

8207421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 8207421 is about 2864.8596824277. The cubic root of 8207421 is about 201.7137811586.

The spelling of 8207421 in words is "eight million, two hundred seven thousand, four hundred twenty-one".