33345421 has 4 divisors (see below), whose sum is σ = 33357852. Its totient is φ = 33332992.

The previous prime is 33345409. The next prime is 33345463. The reversal of 33345421 is 12454333.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 30404196 + 2941225 = 5514^2 + 1715^2 .

It is a cyclic number.

It is not a de Polignac number, because 33345421 - 2⁷ = 33345293 is a prime.

It is a super-2 number, since 2×33345421² = 2223834203334482, 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 (33345401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340 + ... + 8173.

It is an arithmetic number, because the mean of its divisors is an integer number (8339463).

Almost surely, 2^33345421 is an apocalyptic number.

It is an amenable number.

33345421 is a deficient number, since it is larger than the sum of its proper divisors (12431).

33345421 is an equidigital number, since it uses as much as digits as its factorization.

33345421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12430.

The product of its digits is 4320, while the sum is 25.

The square root of 33345421 is about 5774.5494196517. The cubic root of 33345421 is about 321.8686918800.

Adding to 33345421 its reverse (12454333), we get a palindrome (45799754).

It can be divided in two parts, 333 and 45421, that added together give a palindrome (45754).

The spelling of 33345421 in words is "thirty-three million, three hundred forty-five thousand, four hundred twenty-one".