2220575821 has 4 divisors (see below), whose sum is σ = 2262473532. Its totient is φ = 2178678112.

The previous prime is 2220575813. The next prime is 2220575827. The reversal of 2220575821 is 1285750222.

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 1324232100 + 896343721 = 36390^2 + 29939^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220575821 - 2³ = 2220575813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220575827) 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, 20948776 + ... + 20948881.

It is an arithmetic number, because the mean of its divisors is an integer number (565618383).

Almost surely, 2^2220575821 is an apocalyptic number.

It is an amenable number.

2220575821 is a deficient number, since it is larger than the sum of its proper divisors (41897711).

2220575821 is an equidigital number, since it uses as much as digits as its factorization.

2220575821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41897710.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 2220575821 is about 47122.9861214249. The cubic root of 2220575821 is about 1304.6335286250.

The spelling of 2220575821 in words is "two billion, two hundred twenty million, five hundred seventy-five thousand, eight hundred twenty-one".