33844021 has 2 divisors, whose sum is σ = 33844022. Its totient is φ = 33844020.

The previous prime is 33844003. The next prime is 33844037. The reversal of 33844021 is 12044833.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31203396 + 2640625 = 5586^2 + 1625^2 .

It is a cyclic number.

It is not a de Polignac number, because 33844021 - 2⁷ = 33843893 is a prime.

It is a super-2 number, since 2×33844021² = 2290835514896882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33844001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16922010 + 16922011.

It is an arithmetic number, because the mean of its divisors is an integer number (16922011).

Almost surely, 2^33844021 is an apocalyptic number.

It is an amenable number.

33844021 is a deficient number, since it is larger than the sum of its proper divisors (1).

33844021 is an equidigital number, since it uses as much as digits as its factorization.

33844021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 33844021 is about 5817.5614307027. The cubic root of 33844021 is about 323.4650172750.

Adding to 33844021 its reverse (12044833), we get a palindrome (45888854).

The spelling of 33844021 in words is "thirty-three million, eight hundred forty-four thousand, twenty-one".