8019421 has 4 divisors (see below), whose sum is σ = 8278144. Its totient is φ = 7760700.

The previous prime is 8019413. The next prime is 8019439. The reversal of 8019421 is 1249108.

It is a happy number.

8019421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 8019421 - 2³ = 8019413 is a prime.

It is a super-2 number, since 2×8019421² = 128622226350482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8019481) 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, 129315 + ... + 129376.

It is an arithmetic number, because the mean of its divisors is an integer number (2069536).

Almost surely, 2^8019421 is an apocalyptic number.

It is an amenable number.

8019421 is a deficient number, since it is larger than the sum of its proper divisors (258723).

8019421 is a wasteful number, since it uses less digits than its factorization.

8019421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258722.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 8019421 is about 2831.8582238523. The cubic root of 8019421 is about 200.1617108794.

The spelling of 8019421 in words is "eight million, nineteen thousand, four hundred twenty-one".