2021066815 has 8 divisors (see below), whose sum is σ = 2438680608. Its totient is φ = 1607919840.

The previous prime is 2021066813. The next prime is 2021066891. The reversal of 2021066815 is 5186601202.

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

It is not a de Polignac number, because 2021066815 - 2¹ = 2021066813 is a prime.

It is a super-2 number, since 2×2021066815² = 8169422141388488450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021066813) 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 7 ways as a sum of consecutive naturals, for example, 1115707 + ... + 1117516.

It is an arithmetic number, because the mean of its divisors is an integer number (304835076).

Almost surely, 2^2021066815 is an apocalyptic number.

2021066815 is a deficient number, since it is larger than the sum of its proper divisors (417613793).

2021066815 is a wasteful number, since it uses less digits than its factorization.

2021066815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2233409.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 2021066815 is about 44956.2767030367. The cubic root of 2021066815 is about 1264.3293616999.

It can be divided in two parts, 20210 and 66815, that added together give a square (87025 = 295²).

The spelling of 2021066815 in words is "two billion, twenty-one million, sixty-six thousand, eight hundred fifteen".