2220220121 has 4 divisors (see below), whose sum is σ = 2537394432. Its totient is φ = 1903045812.

The previous prime is 2220220073. The next prime is 2220220157. The reversal of 2220220121 is 1210220222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2220220121 - 2¹⁸ = 2219957977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2220220096 and 2220220105.

It is not an unprimeable number, because it can be changed into a prime (2220220181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158587145 + ... + 158587158.

It is an arithmetic number, because the mean of its divisors is an integer number (634348608).

Almost surely, 2^2220220121 is an apocalyptic number.

It is an amenable number.

2220220121 is a deficient number, since it is larger than the sum of its proper divisors (317174311).

2220220121 is an equidigital number, since it uses as much as digits as its factorization.

2220220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317174310.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2220220121 is about 47119.2118036794. The cubic root of 2220220121 is about 1304.5638645733.

Adding to 2220220121 its reverse (1210220222), we get a palindrome (3430440343).

The spelling of 2220220121 in words is "two billion, two hundred twenty million, two hundred twenty thousand, one hundred twenty-one".