2005546821 has 12 divisors (see below), whose sum is σ = 2720167872. Its totient is φ = 1314362824.

The previous prime is 2005546819. The next prime is 2005546841. The reversal of 2005546821 is 1286455002.

It is not a de Polignac number, because 2005546821 - 2¹ = 2005546819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005546841) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 85581 + ... + 106466.

It is an arithmetic number, because the mean of its divisors is an integer number (226680656).

Almost surely, 2^2005546821 is an apocalyptic number.

It is an amenable number.

2005546821 is a deficient number, since it is larger than the sum of its proper divisors (714621051).

2005546821 is an equidigital number, since it uses as much as digits as its factorization.

2005546821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192168 (or 192109 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 2005546821 is about 44783.3319550924. The cubic root of 2005546821 is about 1261.0847341886.

The spelling of 2005546821 in words is "two billion, five million, five hundred forty-six thousand, eight hundred twenty-one".