1213123332133 has 4 divisors (see below), whose sum is σ = 1213125570540. Its totient is φ = 1213121093728.

The previous prime is 1213123332107. The next prime is 1213123332149. The reversal of 1213123332133 is 3312333213121.

It is a happy number.

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 1127404374849 + 85718957284 = 1061793^2 + 292778^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213123332133 - 2¹⁷ = 1213123201061 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 (1213123332173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261513 + ... + 1579441.

It is an arithmetic number, because the mean of its divisors is an integer number (303281392635).

Almost surely, 2^{1213123332133} is an apocalyptic number.

It is an amenable number.

1213123332133 is a deficient number, since it is larger than the sum of its proper divisors (2238407).

1213123332133 is an equidigital number, since it uses as much as digits as its factorization.

1213123332133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2238406.

The product of its digits is 5832, while the sum is 28.

Adding to 1213123332133 its reverse (3312333213121), we get a palindrome (4525456545254).

The spelling of 1213123332133 in words is "one trillion, two hundred thirteen billion, one hundred twenty-three million, three hundred thirty-two thousand, one hundred thirty-three".