33545240221 has 4 divisors (see below), whose sum is σ = 35310779200. Its totient is φ = 31779701244.

The previous prime is 33545240203. The next prime is 33545240227. The reversal of 33545240221 is 12204254533.

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: 12204254533 = 2393 ⋅5099981.

It is a cyclic number.

It is not a de Polignac number, because 33545240221 - 2⁵ = 33545240189 is a prime.

It is a super-2 number, since 2×33545240221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33545240227) 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, 882769461 + ... + 882769498.

It is an arithmetic number, because the mean of its divisors is an integer number (8827694800).

Almost surely, 2^33545240221 is an apocalyptic number.

It is an amenable number.

33545240221 is a deficient number, since it is larger than the sum of its proper divisors (1765538979).

33545240221 is a wasteful number, since it uses less digits than its factorization.

33545240221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1765538978.

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 33545240221 its reverse (12204254533), we get a palindrome (45749494754).

The spelling of 33545240221 in words is "thirty-three billion, five hundred forty-five million, two hundred forty thousand, two hundred twenty-one".