33402421 has 8 divisors (see below), whose sum is σ = 36091160. Its totient is φ = 30730752.

The previous prime is 33402409. The next prime is 33402427. The reversal of 33402421 is 12420433.

It can be written as a sum of positive squares in 4 ways, for example, as 5428900 + 27973521 = 2330^2 + 5289^2 .

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

It is not a de Polignac number, because 33402421 - 2¹⁹ = 32878133 is a prime.

It is a super-2 number, since 2×33402421² = 2231443457322482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33402427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36 + ... + 8173.

It is an arithmetic number, because the mean of its divisors is an integer number (4511395).

Almost surely, 2^33402421 is an apocalyptic number.

It is an amenable number.

33402421 is a deficient number, since it is larger than the sum of its proper divisors (2688739).

33402421 is a wasteful number, since it uses less digits than its factorization.

33402421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8535.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 33402421 is about 5779.4827623240. The cubic root of 33402421 is about 322.0519861283.

Adding to 33402421 its reverse (12420433), we get a palindrome (45822854).

The spelling of 33402421 in words is "thirty-three million, four hundred two thousand, four hundred twenty-one".