33208421 has 2 divisors, whose sum is σ = 33208422. Its totient is φ = 33208420.

The previous prime is 33208411. The next prime is 33208423. The reversal of 33208421 is 12480233.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32615521 + 592900 = 5711^2 + 770^2 .

It is a cyclic number.

It is not a de Polignac number, because 33208421 - 2¹⁰ = 33207397 is a prime.

It is a super-2 number, since 2×33208421² = 2205598450626482, which contains 22 as substring.

Together with 33208423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33208423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16604210 + 16604211.

It is an arithmetic number, because the mean of its divisors is an integer number (16604211).

Almost surely, 2^33208421 is an apocalyptic number.

It is an amenable number.

33208421 is a deficient number, since it is larger than the sum of its proper divisors (1).

33208421 is an equidigital number, since it uses as much as digits as its factorization.

33208421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 33208421 is about 5762.6748129666. The cubic root of 33208421 is about 321.4272865604.

Adding to 33208421 its reverse (12480233), we get a palindrome (45688654).

The spelling of 33208421 in words is "thirty-three million, two hundred eight thousand, four hundred twenty-one".