33120421 has 2 divisors, whose sum is σ = 33120422. Its totient is φ = 33120420.

The previous prime is 33120419. The next prime is 33120467. The reversal of 33120421 is 12402133.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32092225 + 1028196 = 5665^2 + 1014^2 .

It is an emirp because it is prime and its reverse (12402133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33120421 - 2¹ = 33120419 is a prime.

Together with 33120419, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 33120395 and 33120404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33100421) 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 as a sum of consecutive naturals, namely, 16560210 + 16560211.

It is an arithmetic number, because the mean of its divisors is an integer number (16560211).

Almost surely, 2^33120421 is an apocalyptic number.

It is an amenable number.

33120421 is a deficient number, since it is larger than the sum of its proper divisors (1).

33120421 is an equidigital number, since it uses as much as digits as its factorization.

33120421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 33120421 is about 5755.0344047625. The cubic root of 33120421 is about 321.1431154358.

Adding to 33120421 its reverse (12402133), we get a palindrome (45522554).

The spelling of 33120421 in words is "thirty-three million, one hundred twenty thousand, four hundred twenty-one".