33641221 has 2 divisors, whose sum is σ = 33641222. Its totient is φ = 33641220.

The previous prime is 33641183. The next prime is 33641233. The reversal of 33641221 is 12214633.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31922500 + 1718721 = 5650^2 + 1311^2 .

It is a cyclic number.

It is not a de Polignac number, because 33641221 - 2⁹ = 33640709 is a prime.

It is a super-2 number, since 2×33641221² = 2263463500741682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33641192 and 33641201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33641261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16820610 + 16820611.

It is an arithmetic number, because the mean of its divisors is an integer number (16820611).

Almost surely, 2^33641221 is an apocalyptic number.

It is an amenable number.

33641221 is a deficient number, since it is larger than the sum of its proper divisors (1).

33641221 is an equidigital number, since it uses as much as digits as its factorization.

33641221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 22.

The square root of 33641221 is about 5800.1052576656. The cubic root of 33641221 is about 322.8176338942.

Adding to 33641221 its reverse (12214633), we get a palindrome (45855854).

The spelling of 33641221 in words is "thirty-three million, six hundred forty-one thousand, two hundred twenty-one".