11223232121 has 2 divisors, whose sum is σ = 11223232122. Its totient is φ = 11223232120.

The previous prime is 11223232117. The next prime is 11223232133. The reversal of 11223232121 is 12123232211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10435644025 + 787588096 = 102155^2 + 28064^2 .

It is a cyclic number.

It is not a de Polignac number, because 11223232121 - 2² = 11223232117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11223232093 and 11223232102.

It is not a weakly prime, because it can be changed into another prime (11223232171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5611616060 + 5611616061.

It is an arithmetic number, because the mean of its divisors is an integer number (5611616061).

Almost surely, 2^11223232121 is an apocalyptic number.

It is an amenable number.

11223232121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11223232121 is an equidigital number, since it uses as much as digits as its factorization.

11223232121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 20.

Adding to 11223232121 its reverse (12123232211), we get a palindrome (23346464332).

The spelling of 11223232121 in words is "eleven billion, two hundred twenty-three million, two hundred thirty-two thousand, one hundred twenty-one".