1213211033 has 4 divisors (see below), whose sum is σ = 1242801588. Its totient is φ = 1183620480.

The previous prime is 1213211011. The next prime is 1213211039. The reversal of 1213211033 is 3301123121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3301123121 = 17 ⋅194183713.

It can be written as a sum of positive squares in 2 ways, for example, as 29300569 + 1183910464 = 5413^2 + 34408^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213211033 - 2¹² = 1213206937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213211039) 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, 14795216 + ... + 14795297.

It is an arithmetic number, because the mean of its divisors is an integer number (310700397).

Almost surely, 2^1213211033 is an apocalyptic number.

It is an amenable number.

1213211033 is a deficient number, since it is larger than the sum of its proper divisors (29590555).

1213211033 is an equidigital number, since it uses as much as digits as its factorization.

1213211033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29590554.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1213211033 is about 34831.1790354561. The cubic root of 1213211033 is about 1066.5440168331.

Adding to 1213211033 its reverse (3301123121), we get a palindrome (4514334154).

The spelling of 1213211033 in words is "one billion, two hundred thirteen million, two hundred eleven thousand, thirty-three".