33306421 has 2 divisors, whose sum is σ = 33306422. Its totient is φ = 33306420.

The previous prime is 33306407. The next prime is 33306443. The reversal of 33306421 is 12460333.

It is an a-pointer prime, because the next prime (33306443) can be obtained adding 33306421 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22905796 + 10400625 = 4786^2 + 3225^2 .

It is a cyclic number.

It is not a de Polignac number, because 33306421 - 2⁷ = 33306293 is a prime.

It is a super-2 number, since 2×33306421² = 2218635359658482, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 33306392 and 33306401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33301421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16653210 + 16653211.

It is an arithmetic number, because the mean of its divisors is an integer number (16653211).

Almost surely, 2^33306421 is an apocalyptic number.

It is an amenable number.

33306421 is a deficient number, since it is larger than the sum of its proper divisors (1).

33306421 is an equidigital number, since it uses as much as digits as its factorization.

33306421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 22.

The square root of 33306421 is about 5771.1715448425. The cubic root of 33306421 is about 321.7431596416.

Adding to 33306421 its reverse (12460333), we get a palindrome (45766754).

The spelling of 33306421 in words is "thirty-three million, three hundred six thousand, four hundred twenty-one".