6840521420 has 12 divisors (see below), whose sum is σ = 14365095024. Its totient is φ = 2736208560.

The previous prime is 6840521377. The next prime is 6840521431. The reversal of 6840521420 is 241250486.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171013016 + ... + 171013055.

It is an arithmetic number, because the mean of its divisors is an integer number (1197091252).

Almost surely, 2^6840521420 is an apocalyptic number.

It is an amenable number.

6840521420 is an abundant number, since it is smaller than the sum of its proper divisors (7524573604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6840521420 is a wasteful number, since it uses less digits than its factorization.

6840521420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342026080 (or 342026078 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 6840521420 is about 82707.4447676870. Note that the first 3 decimals coincide. The cubic root of 6840521420 is about 1898.2922253891.

The spelling of 6840521420 in words is "six billion, eight hundred forty million, five hundred twenty-one thousand, four hundred twenty".