1232121213 has 20 divisors (see below), whose sum is σ = 1847160348. Its totient is φ = 818475840.

The previous prime is 1232121211. The next prime is 1232121221. The reversal of 1232121213 is 3121212321.

It can be written as a sum of positive squares in 2 ways, for example, as 280830564 + 951290649 = 16758^2 + 30843^2 .

It is not a de Polignac number, because 1232121213 - 2¹ = 1232121211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1232121211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4306 + ... + 49827.

Almost surely, 2^1232121213 is an apocalyptic number.

It is an amenable number.

1232121213 is a deficient number, since it is larger than the sum of its proper divisors (615039135).

1232121213 is an equidigital number, since it uses as much as digits as its factorization.

1232121213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54426 (or 54417 counting only the distinct ones).

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

The square root of 1232121213 is about 35101.5841950189. The cubic root of 1232121213 is about 1072.0568387685.

Adding to 1232121213 its reverse (3121212321), we get a palindrome (4353333534).

The spelling of 1232121213 in words is "one billion, two hundred thirty-two million, one hundred twenty-one thousand, two hundred thirteen".