2113222121 has 2 divisors, whose sum is σ = 2113222122. Its totient is φ = 2113222120.

The previous prime is 2113222117. The next prime is 2113222127. The reversal of 2113222121 is 1212223112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2112781225 + 440896 = 45965^2 + 664^2 .

It is a cyclic number.

It is not a de Polignac number, because 2113222121 - 2² = 2113222117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2113222121.

It is not a weakly prime, because it can be changed into another prime (2113222127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056611060 + 1056611061.

It is an arithmetic number, because the mean of its divisors is an integer number (1056611061).

Almost surely, 2^2113222121 is an apocalyptic number.

It is an amenable number.

2113222121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2113222121 is an equidigital number, since it uses as much as digits as its factorization.

2113222121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96, while the sum is 17.

The square root of 2113222121 is about 45969.7957467727. The cubic root of 2113222121 is about 1283.2611587153.

Adding to 2113222121 its reverse (1212223112), we get a palindrome (3325445233).

Subtracting from 2113222121 its reverse (1212223112), we obtain a palindrome (900999009).

The spelling of 2113222121 in words is "two billion, one hundred thirteen million, two hundred twenty-two thousand, one hundred twenty-one".