12291821033 has 4 divisors (see below), whose sum is σ = 12591621588. Its totient is φ = 11992020480.

The previous prime is 12291821027. The next prime is 12291821039. The reversal of 12291821033 is 33012819221.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (12291821027) and next prime (12291821039).

It can be written as a sum of positive squares in 2 ways, for example, as 2716807129 + 9575013904 = 52123^2 + 97852^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12291821033 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12291821039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149900216 + ... + 149900297.

It is an arithmetic number, because the mean of its divisors is an integer number (3147905397).

Almost surely, 2^12291821033 is an apocalyptic number.

It is an amenable number.

12291821033 is a deficient number, since it is larger than the sum of its proper divisors (299800555).

12291821033 is an equidigital number, since it uses as much as digits as its factorization.

12291821033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299800554.

The product of its (nonzero) digits is 5184, while the sum is 32.

The spelling of 12291821033 in words is "twelve billion, two hundred ninety-one million, eight hundred twenty-one thousand, thirty-three".