33121243 has 4 divisors (see below), whose sum is σ = 33682680. Its totient is φ = 32559808.

The previous prime is 33121213. The next prime is 33121247. The reversal of 33121243 is 34212133.

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

It is a cyclic number.

It is not a de Polignac number, because 33121243 - 2¹⁷ = 32990171 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33121243.

It is not an unprimeable number, because it can be changed into a prime (33121247) 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, 280630 + ... + 280747.

It is an arithmetic number, because the mean of its divisors is an integer number (8420670).

Almost surely, 2^33121243 is an apocalyptic number.

33121243 is a deficient number, since it is larger than the sum of its proper divisors (561437).

33121243 is an equidigital number, since it uses as much as digits as its factorization.

33121243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561436.

The product of its digits is 432, while the sum is 19.

The square root of 33121243 is about 5755.1058200523. The cubic root of 33121243 is about 321.1457721800.

Adding to 33121243 its reverse (34212133), we get a palindrome (67333376).

The spelling of 33121243 in words is "thirty-three million, one hundred twenty-one thousand, two hundred forty-three".