33273721 has 4 divisors (see below), whose sum is σ = 35833252. Its totient is φ = 30714192.

The previous prime is 33273719. The next prime is 33273727. The reversal of 33273721 is 12737233.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12737233 = 17 ⋅749249.

It can be written as a sum of positive squares in 2 ways, for example, as 19316025 + 13957696 = 4395^2 + 3736^2 .

It is a cyclic number.

It is not a de Polignac number, because 33273721 - 2¹ = 33273719 is a prime.

It is a super-2 number, since 2×33273721² = 2214281018371682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 33273721.

It is not an unprimeable number, because it can be changed into a prime (33273727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1279746 + ... + 1279771.

It is an arithmetic number, because the mean of its divisors is an integer number (8958313).

Almost surely, 2^33273721 is an apocalyptic number.

It is an amenable number.

33273721 is a deficient number, since it is larger than the sum of its proper divisors (2559531).

33273721 is a wasteful number, since it uses less digits than its factorization.

33273721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2559530.

The product of its digits is 5292, while the sum is 28.

The square root of 33273721 is about 5768.3378021749. The cubic root of 33273721 is about 321.6378301383.

The spelling of 33273721 in words is "thirty-three million, two hundred seventy-three thousand, seven hundred twenty-one".