8253821421 has 12 divisors (see below), whose sum is σ = 11923778880. Its totient is φ = 5501812680.

The previous prime is 8253821417. The next prime is 8253821441. The reversal of 8253821421 is 1241283528.

It is a happy number.

8253821421 is a `hidden beast` number, since 82 + 538 + 2 + 1 + 42 + 1 = 666.

It is not a de Polignac number, because 8253821421 - 2² = 8253821417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8253821441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14860 + ... + 129338.

It is an arithmetic number, because the mean of its divisors is an integer number (993648240).

Almost surely, 2^8253821421 is an apocalyptic number.

It is an amenable number.

8253821421 is a deficient number, since it is larger than the sum of its proper divisors (3669957459).

8253821421 is a wasteful number, since it uses less digits than its factorization.

8253821421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122496 (or 122493 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 8253821421 is about 90850.5444177414. The cubic root of 8253821421 is about 2020.9319475967.

The spelling of 8253821421 in words is "eight billion, two hundred fifty-three million, eight hundred twenty-one thousand, four hundred twenty-one".