1213240133 has 32 divisors (see below), whose sum is σ = 1475905536. Its totient is φ = 974939328.

The previous prime is 1213240129. The next prime is 1213240159. The reversal of 1213240133 is 3310423121.

It is a cyclic number.

It is not a de Polignac number, because 1213240133 - 2² = 1213240129 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213240123) 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 31 ways as a sum of consecutive naturals, for example, 2177891 + ... + 2178447.

It is an arithmetic number, because the mean of its divisors is an integer number (46122048).

Almost surely, 2^1213240133 is an apocalyptic number.

It is an amenable number.

1213240133 is a deficient number, since it is larger than the sum of its proper divisors (262665403).

1213240133 is a wasteful number, since it uses less digits than its factorization.

1213240133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1213240133 is about 34831.5967621354. The cubic root of 1213240133 is about 1066.5525441164.

Adding to 1213240133 its reverse (3310423121), we get a palindrome (4523663254).

The spelling of 1213240133 in words is "one billion, two hundred thirteen million, two hundred forty thousand, one hundred thirty-three".