2213312121 has 10 divisors (see below), whose sum is σ = 3306305882. Its totient is φ = 1475541360.

The previous prime is 2213312083. The next prime is 2213312137. The reversal of 2213312121 is 1212133122.

It can be written as a sum of positive squares in only one way, i.e., 1151855721 + 1061456400 = 33939^2 + 32580^2 .

It is not a de Polignac number, because 2213312121 - 2⁷ = 2213311993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2213312094 and 2213312103.

It is not an unprimeable number, because it can be changed into a prime (2213312021) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 13662340 + ... + 13662501.

Almost surely, 2^2213312121 is an apocalyptic number.

It is an amenable number.

2213312121 is a deficient number, since it is larger than the sum of its proper divisors (1092993761).

2213312121 is an equidigital number, since it uses as much as digits as its factorization.

2213312121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27324853 (or 27324844 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 2213312121 is about 47045.8512623589. The cubic root of 2213312121 is about 1303.2094508284.

Adding to 2213312121 its reverse (1212133122), we get a palindrome (3425445243).

The spelling of 2213312121 in words is "two billion, two hundred thirteen million, three hundred twelve thousand, one hundred twenty-one".