33423521 has 4 divisors (see below), whose sum is σ = 33485844. Its totient is φ = 33361200.

The previous prime is 33423517. The next prime is 33423539. The reversal of 33423521 is 12532433.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12532433 = 53 ⋅236461.

It can be written as a sum of positive squares in 2 ways, for example, as 4950625 + 28472896 = 2225^2 + 5336^2 .

It is a cyclic number.

It is not a de Polignac number, because 33423521 - 2² = 33423517 is a prime.

It is a super-2 number, since 2×33423521² = 2234263512074882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33423121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30350 + ... + 31431.

It is an arithmetic number, because the mean of its divisors is an integer number (8371461).

Almost surely, 2^33423521 is an apocalyptic number.

It is an amenable number.

33423521 is a deficient number, since it is larger than the sum of its proper divisors (62323).

33423521 is an equidigital number, since it uses as much as digits as its factorization.

33423521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62322.

The product of its digits is 2160, while the sum is 23.

The square root of 33423521 is about 5781.3078970074. The cubic root of 33423521 is about 322.1197842735.

Adding to 33423521 its reverse (12532433), we get a palindrome (45955954).

The spelling of 33423521 in words is "thirty-three million, four hundred twenty-three thousand, five hundred twenty-one".