33031921 has 8 divisors (see below), whose sum is σ = 35648424. Its totient is φ = 30426240.

The previous prime is 33031909. The next prime is 33031931. The reversal of 33031921 is 12913033.

It can be written as a sum of positive squares in 4 ways, for example, as 26896 + 33005025 = 164^2 + 5745^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 33031921 - 2⁷ = 33031793 is a prime.

It is a super-2 number, since 2×33031921² = 2182215609900482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33031892 and 33031901.

It is not an unprimeable number, because it can be changed into a prime (33031931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4335 + ... + 9211.

It is an arithmetic number, because the mean of its divisors is an integer number (4456053).

Almost surely, 2^33031921 is an apocalyptic number.

It is an amenable number.

33031921 is a deficient number, since it is larger than the sum of its proper divisors (2616503).

33031921 is a wasteful number, since it uses less digits than its factorization.

33031921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5411.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 33031921 is about 5747.3403414101. The cubic root of 33031921 is about 320.8568215933.

Adding to 33031921 its reverse (12913033), we get a palindrome (45944954).

The spelling of 33031921 in words is "thirty-three million, thirty-one thousand, nine hundred twenty-one".