2220204121 has 4 divisors (see below), whose sum is σ = 2225020644. Its totient is φ = 2215387600.

The previous prime is 2220204089. The next prime is 2220204139. The reversal of 2220204121 is 1214020222.

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 322382025 + 1897822096 = 17955^2 + 43564^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220204121 - 2⁵ = 2220204089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2220204095 and 2220204104.

It is not an unprimeable number, because it can be changed into a prime (2220204521) 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, 2407570 + ... + 2408491.

It is an arithmetic number, because the mean of its divisors is an integer number (556255161).

Almost surely, 2^2220204121 is an apocalyptic number.

It is an amenable number.

2220204121 is a deficient number, since it is larger than the sum of its proper divisors (4816523).

2220204121 is an equidigital number, since it uses as much as digits as its factorization.

2220204121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4816522.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 2220204121 is about 47119.0420212466. The cubic root of 2220204121 is about 1304.5607307891.

Adding to 2220204121 its reverse (1214020222), we get a palindrome (3434224343).

The spelling of 2220204121 in words is "two billion, two hundred twenty million, two hundred four thousand, one hundred twenty-one".