2021239806 has 16 divisors (see below), whose sum is σ = 4093651200. Its totient is φ = 665218008.

The previous prime is 2021239799. The next prime is 2021239859. The reversal of 2021239806 is 6089321202.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2131636 + ... + 2132583.

It is an arithmetic number, because the mean of its divisors is an integer number (255853200).

Almost surely, 2^2021239806 is an apocalyptic number.

2021239806 is an abundant number, since it is smaller than the sum of its proper divisors (2072411394).

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

2021239806 is a wasteful number, since it uses less digits than its factorization.

2021239806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4264303.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 2021239806 is about 44958.2006534959. The cubic root of 2021239806 is about 1264.3654336330.

The spelling of 2021239806 in words is "two billion, twenty-one million, two hundred thirty-nine thousand, eight hundred six".