8012819021 has 4 divisors (see below), whose sum is σ = 8054336412. Its totient is φ = 7971301632.

The previous prime is 8012818999. The next prime is 8012819033. The reversal of 8012819021 is 1209182108.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2479542025 + 5533276996 = 49795^2 + 74386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8012819021 is a prime.

It is a super-3 number, since 3×8012819021³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8012819071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20758406 + ... + 20758791.

It is an arithmetic number, because the mean of its divisors is an integer number (2013584103).

Almost surely, 2^8012819021 is an apocalyptic number.

It is an amenable number.

8012819021 is a deficient number, since it is larger than the sum of its proper divisors (41517391).

8012819021 is a wasteful number, since it uses less digits than its factorization.

8012819021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41517390.

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 8012819021 is about 89514.3509220728. The cubic root of 8012819021 is about 2001.0676816765.

The spelling of 8012819021 in words is "eight billion, twelve million, eight hundred nineteen thousand, twenty-one".