33420421 has 4 divisors (see below), whose sum is σ = 33432012. Its totient is φ = 33408832.

The previous prime is 33420407. The next prime is 33420451. The reversal of 33420421 is 12402433.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12402433 = 1301 ⋅9533.

It can be written as a sum of positive squares in 2 ways, for example, as 24117921 + 9302500 = 4911^2 + 3050^2 .

It is a cyclic number.

It is not a de Polignac number, because 33420421 - 2⁵ = 33420389 is a prime.

It is a super-2 number, since 2×33420421² = 2233849079634482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33420451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2295 + ... + 8491.

It is an arithmetic number, because the mean of its divisors is an integer number (8358003).

Almost surely, 2^33420421 is an apocalyptic number.

It is an amenable number.

33420421 is a deficient number, since it is larger than the sum of its proper divisors (11591).

33420421 is an equidigital number, since it uses as much as digits as its factorization.

33420421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11590.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 33420421 is about 5781.0397853673. The cubic root of 33420421 is about 322.1098251971.

Adding to 33420421 its reverse (12402433), we get a palindrome (45822854).

The spelling of 33420421 in words is "thirty-three million, four hundred twenty thousand, four hundred twenty-one".