33542221 has 4 divisors (see below), whose sum is σ = 33581952. Its totient is φ = 33502492.

The previous prime is 33542219. The next prime is 33542227. The reversal of 33542221 is 12224533.

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: 12224533 = 2903 ⋅4211.

It is a cyclic number.

It is not a de Polignac number, because 33542221 - 2¹ = 33542219 is a prime.

It is a super-2 number, since 2×33542221² = 2250161179225682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33542192 and 33542201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33542227) 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, 18571 + ... + 20296.

It is an arithmetic number, because the mean of its divisors is an integer number (8395488).

Almost surely, 2^33542221 is an apocalyptic number.

It is an amenable number.

33542221 is a deficient number, since it is larger than the sum of its proper divisors (39731).

33542221 is an equidigital number, since it uses as much as digits as its factorization.

33542221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39730.

The product of its digits is 1440, while the sum is 22.

The square root of 33542221 is about 5791.5646417872. The cubic root of 33542221 is about 322.5006582123.

Adding to 33542221 its reverse (12224533), we get a palindrome (45766754).

The spelling of 33542221 in words is "thirty-three million, five hundred forty-two thousand, two hundred twenty-one".