6543900921 has 8 divisors (see below), whose sum is σ = 8855428384. Its totient is φ = 4297487040.

The previous prime is 6543900917. The next prime is 6543900929. The reversal of 6543900921 is 1290093456.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6543900921 - 2² = 6543900917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6543900921.

It is not an unprimeable number, because it can be changed into a prime (6543900929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16278160 + ... + 16278561.

It is an arithmetic number, because the mean of its divisors is an integer number (1106928548).

Almost surely, 2^6543900921 is an apocalyptic number.

It is an amenable number.

6543900921 is a deficient number, since it is larger than the sum of its proper divisors (2311527463).

6543900921 is a wasteful number, since it uses less digits than its factorization.

6543900921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32556791.

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 6543900921 is about 80894.3812696531. The cubic root of 6543900921 is about 1870.4477104879.

The spelling of 6543900921 in words is "six billion, five hundred forty-three million, nine hundred thousand, nine hundred twenty-one".