21533341 has 8 divisors (see below), whose sum is σ = 22328280. Its totient is φ = 20741952.

The previous prime is 21533333. The next prime is 21533357. The reversal of 21533341 is 14333512.

It can be written as a sum of positive squares in 4 ways, for example, as 2576025 + 18957316 = 1605^2 + 4354^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21533341 - 2³ = 21533333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21503341) 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 in 7 ways as a sum of consecutive naturals, for example, 20751 + ... + 21763.

It is an arithmetic number, because the mean of its divisors is an integer number (2791035).

Almost surely, 2^21533341 is an apocalyptic number.

It is an amenable number.

21533341 is a deficient number, since it is larger than the sum of its proper divisors (794939).

21533341 is a wasteful number, since it uses less digits than its factorization.

21533341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775.

The product of its digits is 1080, while the sum is 22.

The square root of 21533341 is about 4640.4031074897. The cubic root of 21533341 is about 278.2085499271.

Adding to 21533341 its reverse (14333512), we get a palindrome (35866853).

The spelling of 21533341 in words is "twenty-one million, five hundred thirty-three thousand, three hundred forty-one".