2220022121 has 4 divisors (see below), whose sum is σ = 2274169044. Its totient is φ = 2165875200.

The previous prime is 2220022109. The next prime is 2220022151. The reversal of 2220022121 is 1212200222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1212200222 = 2 ⋅606100111.

It can be written as a sum of positive squares in 2 ways, for example, as 391604521 + 1828417600 = 19789^2 + 42760^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220022121 - 2¹⁴ = 2220005737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2220022096 and 2220022105.

It is not an unprimeable number, because it can be changed into a prime (2220022151) 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, 27073400 + ... + 27073481.

It is an arithmetic number, because the mean of its divisors is an integer number (568542261).

Almost surely, 2^2220022121 is an apocalyptic number.

It is an amenable number.

2220022121 is a deficient number, since it is larger than the sum of its proper divisors (54146923).

2220022121 is an equidigital number, since it uses as much as digits as its factorization.

2220022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54146922.

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

The square root of 2220022121 is about 47117.1107030132. The cubic root of 2220022121 is about 1304.5250829345.

Adding to 2220022121 its reverse (1212200222), we get a palindrome (3432222343).

The spelling of 2220022121 in words is "two billion, two hundred twenty million, twenty-two thousand, one hundred twenty-one".