1212345533 has 4 divisors (see below), whose sum is σ = 1385537760. Its totient is φ = 1039153308.

The previous prime is 1212345517. The next prime is 1212345539. The reversal of 1212345533 is 3355432121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3355432121 = 46093 ⋅72797.

It is a cyclic number.

It is not a de Polignac number, because 1212345533 - 2⁴ = 1212345517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212345496 and 1212345505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212345539) 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, 86596103 + ... + 86596116.

It is an arithmetic number, because the mean of its divisors is an integer number (346384440).

Almost surely, 2^1212345533 is an apocalyptic number.

It is an amenable number.

1212345533 is a deficient number, since it is larger than the sum of its proper divisors (173192227).

1212345533 is an equidigital number, since it uses as much as digits as its factorization.

1212345533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173192226.

The product of its digits is 10800, while the sum is 29.

The square root of 1212345533 is about 34818.7526054567. The cubic root of 1212345533 is about 1066.2903337230.

Adding to 1212345533 its reverse (3355432121), we get a palindrome (4567777654).

The spelling of 1212345533 in words is "one billion, two hundred twelve million, three hundred forty-five thousand, five hundred thirty-three".