2006885721 has 4 divisors (see below), whose sum is σ = 2675847632. Its totient is φ = 1337923812.

The previous prime is 2006885711. The next prime is 2006885729. The reversal of 2006885721 is 1275886002.

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 not a de Polignac number, because 2006885721 - 2¹⁷ = 2006754649 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 2006885721.

It is not an unprimeable number, because it can be changed into a prime (2006885729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 334480951 + ... + 334480956.

It is an arithmetic number, because the mean of its divisors is an integer number (668961908).

Almost surely, 2^2006885721 is an apocalyptic number.

It is an amenable number.

2006885721 is a deficient number, since it is larger than the sum of its proper divisors (668961911).

2006885721 is an equidigital number, since it uses as much as digits as its factorization.

2006885721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668961910.

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 2006885721 is about 44798.2781030700. The cubic root of 2006885721 is about 1261.3653045103.

The spelling of 2006885721 in words is "two billion, six million, eight hundred eighty-five thousand, seven hundred twenty-one".