33045521 has 4 divisors (see below), whose sum is σ = 33065472. Its totient is φ = 33025572.

The previous prime is 33045499. The next prime is 33045533. The reversal of 33045521 is 12554033.

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: 12554033 = 2309 ⋅5437.

It is a cyclic number.

It is not a de Polignac number, because 33045521 - 2¹⁰ = 33044497 is a prime.

It is a super-2 number, since 2×33045521² = 2184012916322882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33045821) 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, 7241 + ... + 10886.

It is an arithmetic number, because the mean of its divisors is an integer number (8266368).

Almost surely, 2^33045521 is an apocalyptic number.

It is an amenable number.

33045521 is a deficient number, since it is larger than the sum of its proper divisors (19951).

33045521 is a wasteful number, since it uses less digits than its factorization.

33045521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19950.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 33045521 is about 5748.5233756157. The cubic root of 33045521 is about 320.9008502571.

Adding to 33045521 its reverse (12554033), we get a palindrome (45599554).

The spelling of 33045521 in words is "thirty-three million, forty-five thousand, five hundred twenty-one".