33093721 has 2 divisors, whose sum is σ = 33093722. Its totient is φ = 33093720.

The previous prime is 33093719. The next prime is 33093733. The reversal of 33093721 is 12739033.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32775625 + 318096 = 5725^2 + 564^2 .

It is a cyclic number.

It is not a de Polignac number, because 33093721 - 2¹ = 33093719 is a prime.

It is a super-3 number, since 3×33093721³ (a number of 24 digits) contains 333 as substring.

Together with 33093719, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 33093721.

It is not a weakly prime, because it can be changed into another prime (33093701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16546860 + 16546861.

It is an arithmetic number, because the mean of its divisors is an integer number (16546861).

Almost surely, 2^33093721 is an apocalyptic number.

It is an amenable number.

33093721 is a deficient number, since it is larger than the sum of its proper divisors (1).

33093721 is an equidigital number, since it uses as much as digits as its factorization.

33093721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 28.

The square root of 33093721 is about 5752.7142289531. The cubic root of 33093721 is about 321.0567958172.

The spelling of 33093721 in words is "thirty-three million, ninety-three thousand, seven hundred twenty-one".