33223621 has 4 divisors (see below), whose sum is σ = 33239692. Its totient is φ = 33207552.

The previous prime is 33223591. The next prime is 33223639. The reversal of 33223621 is 12632233.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12632233 = 571 ⋅22123.

It can be written as a sum of positive squares in 2 ways, for example, as 27984100 + 5239521 = 5290^2 + 2289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33223621 is a prime.

It is a super-2 number, since 2×33223621² = 2207617984703282, 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 = 33223592 and 33223601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33223651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4380 + ... + 9253.

It is an arithmetic number, because the mean of its divisors is an integer number (8309923).

Almost surely, 2^33223621 is an apocalyptic number.

It is an amenable number.

33223621 is a deficient number, since it is larger than the sum of its proper divisors (16071).

33223621 is a wasteful number, since it uses less digits than its factorization.

33223621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16070.

The product of its digits is 1296, while the sum is 22.

The square root of 33223621 is about 5763.9934940976. The cubic root of 33223621 is about 321.4763198014.

Adding to 33223621 its reverse (12632233), we get a palindrome (45855854).

The spelling of 33223621 in words is "thirty-three million, two hundred twenty-three thousand, six hundred twenty-one".