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33042721 is a prime number
BaseRepresentation
bin111111000001…
…1000100100001
32022011202002111
41332003010201
531424331341
63140115321
7550600315
oct176030441
968152074
1033042721
1117719538
12b095b41
136acbc0a
144561b45
152d7a681
hex1f83121

33042721 has 2 divisors, whose sum is σ = 33042722. Its totient is φ = 33042720.

The previous prime is 33042703. The next prime is 33042731. The reversal of 33042721 is 12724033.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18181696 + 14861025 = 4264^2 + 3855^2 .

It is a cyclic number.

It is not a de Polignac number, because 33042721 - 25 = 33042689 is a prime.

It is a super-2 number, since 2×330427212 = 2183642822167682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33042692 and 33042701.

It is not a weakly prime, because it can be changed into another prime (33042731) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16521360 + 16521361.

It is an arithmetic number, because the mean of its divisors is an integer number (16521361).

Almost surely, 233042721 is an apocalyptic number.

It is an amenable number.

33042721 is a deficient number, since it is larger than the sum of its proper divisors (1).

33042721 is an equidigital number, since it uses as much as digits as its factorization.

33042721 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 33042721 is about 5748.2798296534. The cubic root of 33042721 is about 320.8917865199.

Adding to 33042721 its reverse (12724033), we get a palindrome (45766754).

The spelling of 33042721 in words is "thirty-three million, forty-two thousand, seven hundred twenty-one".