33145421 has 2 divisors, whose sum is σ = 33145422. Its totient is φ = 33145420.

The previous prime is 33145397. The next prime is 33145423. The reversal of 33145421 is 12454133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30680521 + 2464900 = 5539^2 + 1570^2 .

It is a cyclic number.

It is not a de Polignac number, because 33145421 - 2¹⁴ = 33129037 is a prime.

Together with 33145423, 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 (33145423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16572710 + 16572711.

It is an arithmetic number, because the mean of its divisors is an integer number (16572711).

Almost surely, 2^33145421 is an apocalyptic number.

It is an amenable number.

33145421 is a deficient number, since it is larger than the sum of its proper divisors (1).

33145421 is an equidigital number, since it uses as much as digits as its factorization.

33145421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 23.

The square root of 33145421 is about 5757.2060063889. The cubic root of 33145421 is about 321.2238970045.

Adding to 33145421 its reverse (12454133), we get a palindrome (45599554).

The spelling of 33145421 in words is "thirty-three million, one hundred forty-five thousand, four hundred twenty-one".