33222521 has 4 divisors (see below), whose sum is σ = 33273444. Its totient is φ = 33171600.

The previous prime is 33222499. The next prime is 33222523. The reversal of 33222521 is 12522233.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16289296 + 16933225 = 4036^2 + 4115^2 .

It is a cyclic number.

It is not a de Polignac number, because 33222521 - 2¹⁴ = 33206137 is a prime.

It is a super-2 number, since 2×33222521² = 2207471803190882, 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 = 33222493 and 33222502.

It is not an unprimeable number, because it can be changed into a prime (33222523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24470 + ... + 25791.

It is an arithmetic number, because the mean of its divisors is an integer number (8318361).

Almost surely, 2^33222521 is an apocalyptic number.

It is an amenable number.

33222521 is a deficient number, since it is larger than the sum of its proper divisors (50923).

33222521 is an equidigital number, since it uses as much as digits as its factorization.

33222521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50922.

The product of its digits is 720, while the sum is 20.

The square root of 33222521 is about 5763.8980733528. The cubic root of 33222521 is about 321.4727718452.

Adding to 33222521 its reverse (12522233), we get a palindrome (45744754).

The spelling of 33222521 in words is "thirty-three million, two hundred twenty-two thousand, five hundred twenty-one".