33221281 has 4 divisors (see below), whose sum is σ = 35175492. Its totient is φ = 31267072.

The previous prime is 33221263. The next prime is 33221323. The reversal of 33221281 is 18212233.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18212233 = 13 ⋅1400941.

It can be written as a sum of positive squares in 2 ways, for example, as 24840256 + 8381025 = 4984^2 + 2895^2 .

It is a cyclic number.

It is not a de Polignac number, because 33221281 - 2⁵ = 33221249 is a prime.

It is a super-2 number, since 2×33221281² = 2207307022561922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33221261) 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, 977080 + ... + 977113.

It is an arithmetic number, because the mean of its divisors is an integer number (8793873).

Almost surely, 2^33221281 is an apocalyptic number.

It is an amenable number.

33221281 is a deficient number, since it is larger than the sum of its proper divisors (1954211).

33221281 is a wasteful number, since it uses less digits than its factorization.

33221281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954210.

The product of its digits is 576, while the sum is 22.

The square root of 33221281 is about 5763.7905062554. The cubic root of 33221281 is about 321.4687722370.

The spelling of 33221281 in words is "thirty-three million, two hundred twenty-one thousand, two hundred eighty-one".