33033021221 has 4 divisors (see below), whose sum is σ = 33254719500. Its totient is φ = 32811322944.

The previous prime is 33033021179. The next prime is 33033021223. The reversal of 33033021221 is 12212033033.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12212033033 = 3671 ⋅3326623.

It can be written as a sum of positive squares in 2 ways, for example, as 1548422500 + 31484598721 = 39350^2 + 177439^2 .

It is a cyclic number.

It is not a de Polignac number, because 33033021221 - 2²² = 33028826917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33033021193 and 33033021202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33033021223) 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, 110848916 + ... + 110849213.

It is an arithmetic number, because the mean of its divisors is an integer number (8313679875).

Almost surely, 2^33033021221 is an apocalyptic number.

It is an amenable number.

33033021221 is a deficient number, since it is larger than the sum of its proper divisors (221698279).

33033021221 is a wasteful number, since it uses less digits than its factorization.

33033021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221698278.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 33033021221 its reverse (12212033033), we get a palindrome (45245054254).

The spelling of 33033021221 in words is "thirty-three billion, thirty-three million, twenty-one thousand, two hundred twenty-one".