33541221 has 32 divisors (see below), whose sum is σ = 55296000. Its totient is φ = 17646336.

The previous prime is 33541219. The next prime is 33541259. The reversal of 33541221 is 12214533.

It is not a de Polignac number, because 33541221 - 2¹ = 33541219 is a prime.

It is a super-2 number, since 2×33541221² = 2250027012341682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33541201) 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 31 ways as a sum of consecutive naturals, for example, 15780 + ... + 17778.

It is an arithmetic number, because the mean of its divisors is an integer number (1728000).

Almost surely, 2^33541221 is an apocalyptic number.

It is an amenable number.

33541221 is a deficient number, since it is larger than the sum of its proper divisors (21754779).

33541221 is a wasteful number, since it uses less digits than its factorization.

33541221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2073.

The product of its digits is 720, while the sum is 21.

The square root of 33541221 is about 5791.4783086877. The cubic root of 33541221 is about 322.4974532579.

Adding to 33541221 its reverse (12214533), we get a palindrome (45755754).

The spelling of 33541221 in words is "thirty-three million, five hundred forty-one thousand, two hundred twenty-one".