1232121229 has 4 divisors (see below), whose sum is σ = 1248999676. Its totient is φ = 1215242784.

The previous prime is 1232121227. The next prime is 1232121239. The reversal of 1232121229 is 9221212321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9221212321 = 73 ⋅126317977.

It can be written as a sum of positive squares in 2 ways, for example, as 303700329 + 928420900 = 17427^2 + 30470^2 .

It is a cyclic number.

It is not a de Polignac number, because 1232121229 - 2¹ = 1232121227 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1232121221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8439114 + ... + 8439259.

It is an arithmetic number, because the mean of its divisors is an integer number (312249919).

Almost surely, 2^1232121229 is an apocalyptic number.

It is an amenable number.

1232121229 is a deficient number, since it is larger than the sum of its proper divisors (16878447).

1232121229 is an equidigital number, since it uses as much as digits as its factorization.

1232121229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16878446.

The product of its digits is 864, while the sum is 25.

The square root of 1232121229 is about 35101.5844229288. The cubic root of 1232121229 is about 1072.0568434090.

The spelling of 1232121229 in words is "one billion, two hundred thirty-two million, one hundred twenty-one thousand, two hundred twenty-nine".