1211423233 has 4 divisors (see below), whose sum is σ = 1225034820. Its totient is φ = 1197811648.

The previous prime is 1211423207. The next prime is 1211423237. The reversal of 1211423233 is 3323241121.

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 461046784 + 750376449 = 21472^2 + 27393^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211423233 - 2⁹ = 1211422721 is a prime.

It is a super-3 number, since 3×1211423233³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211423237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6805660 + ... + 6805837.

It is an arithmetic number, because the mean of its divisors is an integer number (306258705).

Almost surely, 2^1211423233 is an apocalyptic number.

It is an amenable number.

1211423233 is a deficient number, since it is larger than the sum of its proper divisors (13611587).

1211423233 is an equidigital number, since it uses as much as digits as its factorization.

1211423233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13611586.

The product of its digits is 864, while the sum is 22.

The square root of 1211423233 is about 34805.5057857230. The cubic root of 1211423233 is about 1066.0198692832.

Adding to 1211423233 its reverse (3323241121), we get a palindrome (4534664354).

The spelling of 1211423233 in words is "one billion, two hundred eleven million, four hundred twenty-three thousand, two hundred thirty-three".