1213211233 has 4 divisors (see below), whose sum is σ = 1306535188. Its totient is φ = 1119887280.

The previous prime is 1213211231. The next prime is 1213211267. The reversal of 1213211233 is 3321123121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 234334864 + 978876369 = 15308^2 + 31287^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213211233 - 2¹ = 1213211231 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 1213211233.

It is not an unprimeable number, because it can be changed into a prime (1213211231) 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, 46661958 + ... + 46661983.

It is an arithmetic number, because the mean of its divisors is an integer number (326633797).

Almost surely, 2^1213211233 is an apocalyptic number.

1213211233 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1213211233 is a deficient number, since it is larger than the sum of its proper divisors (93323955).

1213211233 is an equidigital number, since it uses as much as digits as its factorization.

1213211233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93323954.

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

The square root of 1213211233 is about 34831.1819064470. The cubic root of 1213211233 is about 1066.5440754403.

Adding to 1213211233 its reverse (3321123121), we get a palindrome (4534334354).

The spelling of 1213211233 in words is "one billion, two hundred thirteen million, two hundred eleven thousand, two hundred thirty-three".