33645421 has 2 divisors, whose sum is σ = 33645422. Its totient is φ = 33645420.

The previous prime is 33645413. The next prime is 33645487. The reversal of 33645421 is 12454633.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26409321 + 7236100 = 5139^2 + 2690^2 .

It is a cyclic number.

It is not a de Polignac number, because 33645421 - 2³ = 33645413 is a prime.

It is a super-2 number, since 2×33645421² = 2264028708534482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 33645421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33642421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16822710 + 16822711.

It is an arithmetic number, because the mean of its divisors is an integer number (16822711).

Almost surely, 2^33645421 is an apocalyptic number.

It is an amenable number.

33645421 is a deficient number, since it is larger than the sum of its proper divisors (1).

33645421 is an equidigital number, since it uses as much as digits as its factorization.

33645421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 28.

The square root of 33645421 is about 5800.4673087606. The cubic root of 33645421 is about 322.8310675886.

The spelling of 33645421 in words is "thirty-three million, six hundred forty-five thousand, four hundred twenty-one".