2220402121 has 6 divisors (see below), whose sum is σ = 2582916810. Its totient is φ = 1903201776.

The previous prime is 2220402103. The next prime is 2220402131. The reversal of 2220402121 is 1212040222.

It can be written as a sum of positive squares in only one way, i.e., 2214737721 + 5664400 = 47061^2 + 2380^2 .

It is not a de Polignac number, because 2220402121 - 2⁹ = 2220401609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2220402095 and 2220402104.

It is not an unprimeable number, because it can be changed into a prime (2220402131) 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 5 ways as a sum of consecutive naturals, for example, 22657116 + ... + 22657213.

It is an arithmetic number, because the mean of its divisors is an integer number (430486135).

Almost surely, 2^2220402121 is an apocalyptic number.

It is an amenable number.

2220402121 is a deficient number, since it is larger than the sum of its proper divisors (362514689).

2220402121 is an equidigital number, since it uses as much as digits as its factorization.

2220402121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45314343 (or 45314336 counting only the distinct ones).

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

The square root of 2220402121 is about 47121.1430357966. The cubic root of 2220402121 is about 1304.5995103085.

Adding to 2220402121 its reverse (1212040222), we get a palindrome (3432442343).

The spelling of 2220402121 in words is "two billion, two hundred twenty million, four hundred two thousand, one hundred twenty-one".