33724021 has 2 divisors, whose sum is σ = 33724022. Its totient is φ = 33724020.

The previous prime is 33723973. The next prime is 33724079. The reversal of 33724021 is 12042733.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32376100 + 1347921 = 5690^2 + 1161^2 .

It is a cyclic number.

It is not a de Polignac number, because 33724021 - 2¹¹ = 33721973 is a prime.

It is a super-2 number, since 2×33724021² = 2274619184816882, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 33723983 and 33724001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33724081) 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, 16862010 + 16862011.

It is an arithmetic number, because the mean of its divisors is an integer number (16862011).

Almost surely, 2^33724021 is an apocalyptic number.

It is an amenable number.

33724021 is a deficient number, since it is larger than the sum of its proper divisors (1).

33724021 is an equidigital number, since it uses as much as digits as its factorization.

33724021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 33724021 is about 5807.2386725534. The cubic root of 33724021 is about 323.0822636146.

Adding to 33724021 its reverse (12042733), we get a palindrome (45766754).

The spelling of 33724021 in words is "thirty-three million, seven hundred twenty-four thousand, twenty-one".