33660421 has 2 divisors, whose sum is σ = 33660422. Its totient is φ = 33660420.

The previous prime is 33660397. The next prime is 33660433. The reversal of 33660421 is 12406633.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18922500 + 14737921 = 4350^2 + 3839^2 .

It is an emirp because it is prime and its reverse (12406633) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33660421 - 2⁹ = 33659909 is a prime.

It is a super-2 number, since 2×33660421² = 2266047883794482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33661421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16830210 + 16830211.

It is an arithmetic number, because the mean of its divisors is an integer number (16830211).

Almost surely, 2^33660421 is an apocalyptic number.

It is an amenable number.

33660421 is a deficient number, since it is larger than the sum of its proper divisors (1).

33660421 is an equidigital number, since it uses as much as digits as its factorization.

33660421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 33660421 is about 5801.7601639502. The cubic root of 33660421 is about 322.8790359442.

The spelling of 33660421 in words is "thirty-three million, six hundred sixty thousand, four hundred twenty-one".