1211232133 has 8 divisors (see below), whose sum is σ = 1300050648. Its totient is φ = 1124365824.

The previous prime is 1211232131. The next prime is 1211232137. The reversal of 1211232133 is 3312321121.

It can be written as a sum of positive squares in 4 ways, for example, as 327537604 + 883694529 = 18098^2 + 29727^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211232133 - 2¹ = 1211232131 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211232133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211232131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 486766 + ... + 489247.

It is an arithmetic number, because the mean of its divisors is an integer number (162506331).

Almost surely, 2^1211232133 is an apocalyptic number.

It is an amenable number.

1211232133 is a deficient number, since it is larger than the sum of its proper divisors (88818515).

1211232133 is an equidigital number, since it uses as much as digits as its factorization.

1211232133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976103.

The product of its digits is 216, while the sum is 19.

The square root of 1211232133 is about 34802.7604221274. The cubic root of 1211232133 is about 1065.9638120484.

Adding to 1211232133 its reverse (3312321121), we get a palindrome (4523553254).

It can be divided in two parts, 121123 and 2133, that added together give a triangular number (123256 = T₄₉₆).

The spelling of 1211232133 in words is "one billion, two hundred eleven million, two hundred thirty-two thousand, one hundred thirty-three".