2220005621 has 4 divisors (see below), whose sum is σ = 2228258700. Its totient is φ = 2211752544.

The previous prime is 2220005611. The next prime is 2220005633. The reversal of 2220005621 is 1265000222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1265000222 = 2 ⋅632500111.

It can be written as a sum of positive squares in 2 ways, for example, as 778968100 + 1441037521 = 27910^2 + 37961^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220005621 - 2²² = 2215811317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2220005593 and 2220005602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220005611) 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, 4126136 + ... + 4126673.

It is an arithmetic number, because the mean of its divisors is an integer number (557064675).

Almost surely, 2^2220005621 is an apocalyptic number.

It is an amenable number.

2220005621 is a deficient number, since it is larger than the sum of its proper divisors (8253079).

2220005621 is an equidigital number, since it uses as much as digits as its factorization.

2220005621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8253078.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 2220005621 is about 47116.9356070617. The cubic root of 2220005621 is about 1304.5218510272.

Adding to 2220005621 its reverse (1265000222), we get a palindrome (3485005843).

The spelling of 2220005621 in words is "two billion, two hundred twenty million, five thousand, six hundred twenty-one".