33533130221 has 4 divisors (see below), whose sum is σ = 33534937500. Its totient is φ = 33531322944.

The previous prime is 33533130193. The next prime is 33533130247. The reversal of 33533130221 is 12203133533.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12203133533 = 47 ⋅259641139.

It can be written as a sum of positive squares in 2 ways, for example, as 13351802500 + 20181327721 = 115550^2 + 142061^2 .

It is a cyclic number.

It is not a de Polignac number, because 33533130221 - 2²² = 33528935917 is a prime.

It is a super-2 number, since 2×33533130221² (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 (33533130251) 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, 875516 + ... + 913013.

It is an arithmetic number, because the mean of its divisors is an integer number (8383734375).

Almost surely, 2^33533130221 is an apocalyptic number.

It is an amenable number.

33533130221 is a deficient number, since it is larger than the sum of its proper divisors (1807279).

33533130221 is a wasteful number, since it uses less digits than its factorization.

33533130221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1807278.

The product of its (nonzero) digits is 4860, while the sum is 26.

Adding to 33533130221 its reverse (12203133533), we get a palindrome (45736263754).

The spelling of 33533130221 in words is "thirty-three billion, five hundred thirty-three million, one hundred thirty thousand, two hundred twenty-one".