2006730021 has 16 divisors (see below), whose sum is σ = 2689315200. Its totient is φ = 1331001408.

The previous prime is 2006729999. The next prime is 2006730029. The reversal of 2006730021 is 1200376002.

It is a happy number.

It is not a de Polignac number, because 2006730021 - 2⁶ = 2006729957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2006730021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2006730029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 510355 + ... + 514271.

It is an arithmetic number, because the mean of its divisors is an integer number (168082200).

Almost surely, 2^2006730021 is an apocalyptic number.

It is an amenable number.

2006730021 is a deficient number, since it is larger than the sum of its proper divisors (682585179).

2006730021 is a wasteful number, since it uses less digits than its factorization.

2006730021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4748.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 2006730021 is about 44796.5402793564. The cubic root of 2006730021 is about 1261.3326835436.

The spelling of 2006730021 in words is "two billion, six million, seven hundred thirty thousand, twenty-one".