8219421 has 32 divisors (see below), whose sum is σ = 14055680. Its totient is φ = 4650048.

The previous prime is 8219411. The next prime is 8219423. The reversal of 8219421 is 1249128.

It is not a de Polignac number, because 8219421 - 2⁶ = 8219357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8219423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29535 + ... + 29811.

It is an arithmetic number, because the mean of its divisors is an integer number (439240).

Almost surely, 2^8219421 is an apocalyptic number.

It is an amenable number.

8219421 is a deficient number, since it is larger than the sum of its proper divisors (5836259).

8219421 is a wasteful number, since it uses less digits than its factorization.

8219421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450 (or 444 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 8219421 is about 2866.9532608677. The cubic root of 8219421 is about 201.8120412834.

It can be divided in two parts, 82194 and 21, that added together give a triangular number (82215 = T₄₀₅).

The spelling of 8219421 in words is "eight million, two hundred nineteen thousand, four hundred twenty-one".