2816535221 has 4 divisors (see below), whose sum is σ = 2885231244. Its totient is φ = 2747839200.

The previous prime is 2816535203. The next prime is 2816535251. The reversal of 2816535221 is 1225356182.

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 1639359121 + 1177176100 = 40489^2 + 34310^2 .

It is a cyclic number.

It is not a de Polignac number, because 2816535221 - 2¹⁰ = 2816534197 is a prime.

It is a super-2 number, since 2×2816535221² = 15865741302267037682, 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 (2816535251) 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, 34347950 + ... + 34348031.

It is an arithmetic number, because the mean of its divisors is an integer number (721307811).

Almost surely, 2^2816535221 is an apocalyptic number.

It is an amenable number.

2816535221 is a deficient number, since it is larger than the sum of its proper divisors (68696023).

2816535221 is an equidigital number, since it uses as much as digits as its factorization.

2816535221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68696022.

The product of its digits is 28800, while the sum is 35.

The square root of 2816535221 is about 53071.0393811917. The cubic root of 2816535221 is about 1412.2287942095.

The spelling of 2816535221 in words is "two billion, eight hundred sixteen million, five hundred thirty-five thousand, two hundred twenty-one".