2220000121 has 4 divisors (see below), whose sum is σ = 2223279972. Its totient is φ = 2216720272.

The previous prime is 2220000113. The next prime is 2220000143. The reversal of 2220000121 is 1210000222.

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 2196234496 + 23765625 = 46864^2 + 4875^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220000121 - 2³ = 2220000113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2220000098 and 2220000107.

It is not an unprimeable number, because it can be changed into a prime (2220000151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1638910 + ... + 1640263.

It is an arithmetic number, because the mean of its divisors is an integer number (555819993).

Almost surely, 2^2220000121 is an apocalyptic number.

It is an amenable number.

2220000121 is a deficient number, since it is larger than the sum of its proper divisors (3279851).

2220000121 is an equidigital number, since it uses as much as digits as its factorization.

2220000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3279850.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2220000121 is about 47116.8772416000. The cubic root of 2220000121 is about 1304.5207737212.

Adding to 2220000121 its reverse (1210000222), we get a palindrome (3430000343).

The spelling of 2220000121 in words is "two billion, two hundred twenty million, one hundred twenty-one", and thus it is an aban number.